{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,8]],"date-time":"2026-01-08T05:46:26Z","timestamp":1767851186809,"version":"3.49.0"},"reference-count":47,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2004,8,25]],"date-time":"2004-08-25T00:00:00Z","timestamp":1093392000000},"content-version":"vor","delay-in-days":237,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["The Chemical Record"],"published-print":{"date-parts":[[2004,1]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Recent studies of the synthesis, structures, spectroscopic properties, and reactions of a series of isolable metallylenes (R<jats:sub>2<\/jats:sub>E:, E\u2009=\u2009Si (<jats:bold>1<\/jats:bold>), Ge (<jats:bold>2<\/jats:bold>), and Sn (<jats:bold>3<\/jats:bold>); R<jats:sub>2<\/jats:sub>\u2009=\u20091,1,4,4\u2010tetrakis(trimethylsilyl)butane\u20101,4\u2010diyl) are summarized. Because these group\u201014 metallylenes bear the same helmet\u2010like ligand, a straightforward discussion of the element\u2010dependence of the intrinsic properties of the group\u201014 element divalent compounds is possible. All these metallylenes were monomeric both in solution and in the solid state, indicating the effective steric protection by the ligand against dimerization. A small \u03c3\uf8ff\u03c0 conjugation between C\uf8ffSi(substituent) \u03c3 orbitals and the vacant <jats:italic>n<\/jats:italic>p<jats:sub>z<\/jats:sub> orbitals of divalent atoms in R<jats:sub>2<\/jats:sub>E: exists and the extent decreases in the order E\u2009=\u2009Si\u2009&gt;\u2009Ge\u2009&gt;\u2009Sn, as evidenced by UV\u2010vis and NMR spectroscopies and X\u2010ray crystallography. However, the extent of the \u03c3\uf8ff\u03c0 conjugation in metallylenes <jats:bold>1\u20133<\/jats:bold> was much smaller than the electron\u2010donating effects of neighboring nitrogen atoms in known stable cyclic diamino\u2010substituted metallylenes, and hence metallylenes <jats:bold>1\u20133<\/jats:bold> are regarded as the least electronically perturbed. Comparative studies of the unique reactions among these metallylenes are also discussed. \u00a9 2004 The Japan Chemical Journal Forum and Wiley Periodicals, Inc. Chem Rec 4: 243\u2013253; 2004: Published online in Wiley InterScience (<jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"http:\/\/www.interscience.wiley.com\">www.interscience.wiley.com<\/jats:ext-link>) DOI 10.1002\/tcr.20019<\/jats:p>","DOI":"10.1002\/tcr.20019","type":"journal-article","created":{"date-parts":[[2004,8,25]],"date-time":"2004-08-25T23:02:21Z","timestamp":1093474941000},"page":"243-253","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":68,"title":["Comparative chemistry of isolable divalent compounds of silicon, germanium, and tin"],"prefix":"10.1002","volume":"4","author":[{"given":"Mitsuo","family":"Kira","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shintaro","family":"Ishida","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Takeaki","family":"Iwamoto","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2004,8,25]]},"reference":[{"key":"e_1_2_7_2_2","doi-asserted-by":"publisher","DOI":"10.1021\/cr00003a001"},{"key":"e_1_2_7_3_2","doi-asserted-by":"publisher","DOI":"10.1002\/anie.199608281"},{"key":"e_1_2_7_3_3","doi-asserted-by":"publisher","DOI":"10.1002\/0470857250.ch43"},{"key":"e_1_2_7_3_4","doi-asserted-by":"publisher","DOI":"10.1016\/S0022-328X(01)01262-1"},{"key":"e_1_2_7_4_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja9925305"},{"key":"e_1_2_7_5_2","doi-asserted-by":"publisher","DOI":"10.1246\/cl.1999.263"},{"key":"e_1_2_7_6_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja00020a064"},{"key":"e_1_2_7_7_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja00162a014"},{"key":"e_1_2_7_8_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja00085a088"},{"key":"e_1_2_7_9_2","doi-asserted-by":"publisher","DOI":"10.1039\/dt9940002405"},{"key":"e_1_2_7_10_2","doi-asserted-by":"crossref","unstructured":"(a)Gehrhus B.;Lappert M. F.;Heinicke J.;Boese R.;Bl\u00e4ser D.J Chem Soc Chem Commun1995 1931; (b)Gehrhus B.;Hitchcock P. B.;Lappert M. F.;Heinicke J.;Boese R.;Bl\u00e4ser D.J Organomet Chem1996 521 211.","DOI":"10.1039\/C39950001931"},{"key":"e_1_2_7_11_2","doi-asserted-by":"crossref","unstructured":"Heinicke J.;Opera A.;Kindermann M. K.;Karbati T.;Nyul\u00e1szi L.;Veszpr\u00e9mi T.Chem Eur J1998 4 541.","DOI":"10.1002\/(SICI)1521-3765(19980310)4:3<541::AID-CHEM541>3.0.CO;2-#"},{"key":"e_1_2_7_12_2","first-page":"2268","author":"Davidson P. J.","year":"1977","journal-title":"J Chem Soc, Dalton Trans"},{"key":"e_1_2_7_13_2","doi-asserted-by":"publisher","DOI":"10.1039\/c3973000317a"},{"key":"e_1_2_7_14_2","doi-asserted-by":"publisher","DOI":"10.1002\/anie.198705841"},{"key":"e_1_2_7_15_2","doi-asserted-by":"publisher","DOI":"10.1021\/om00052a002"},{"key":"e_1_2_7_16_2","doi-asserted-by":"publisher","DOI":"10.1021\/om9708337"},{"key":"e_1_2_7_17_2","doi-asserted-by":"publisher","DOI":"10.1021\/om990779p"},{"key":"e_1_2_7_18_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0040-4039(00)88480-4"},{"key":"e_1_2_7_19_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0022-328X(01)00998-6"},{"key":"e_1_2_7_20_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.jorganchem.2003.12.025"},{"key":"e_1_2_7_21_2","unstructured":"Iwamoto T.;Ishida S.;Kabuto C.;KiraM.Unpublished results."},{"key":"e_1_2_7_22_2","doi-asserted-by":"publisher","DOI":"10.1002\/anie.198108993"},{"key":"e_1_2_7_23_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja00262a014"},{"key":"e_1_2_7_24_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja00512a059"},{"key":"e_1_2_7_25_2","doi-asserted-by":"publisher","DOI":"10.1246\/cl.1984.1379"},{"key":"e_1_2_7_26_2","doi-asserted-by":"publisher","DOI":"10.1021\/om960929l"},{"key":"e_1_2_7_27_2","doi-asserted-by":"publisher","DOI":"10.1002\/0470025107.ch8"},{"key":"e_1_2_7_28_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0022-328X(03)00542-4"},{"key":"e_1_2_7_29_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja9723287"},{"key":"e_1_2_7_30_2","doi-asserted-by":"publisher","DOI":"10.1002\/0470857269.ch1"},{"key":"e_1_2_7_31_2","doi-asserted-by":"publisher","DOI":"10.1021\/om00003a070"},{"key":"e_1_2_7_32_2","doi-asserted-by":"crossref","first-page":"1526","DOI":"10.1139\/v00-014","volume":"78","author":"Schmedake T. A.","year":"2000","journal-title":"Can J Chem"},{"key":"e_1_2_7_33_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja028192g"},{"key":"e_1_2_7_33_3","unstructured":"(b) Unpublished results."},{"key":"e_1_2_7_34_2","doi-asserted-by":"publisher","DOI":"10.1039\/j19700000348"},{"key":"e_1_2_7_35_2","doi-asserted-by":"publisher","DOI":"10.1002\/1521-3773(20020215)41:4<649::AID-ANIE649>3.0.CO;2-6"},{"key":"e_1_2_7_36_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja025522o"},{"key":"e_1_2_7_37_2","unstructured":"Kira M.;Ishida S.;Iwamoto T.;de Meijere A.;Ito O.;Fujitsuka M.Angew Chem Int Edin press."},{"key":"e_1_2_7_38_2","volume-title":"Free Radicals","author":"Sakurai H.","year":"1973"},{"key":"e_1_2_7_39_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja0356784"},{"key":"e_1_2_7_40_2","doi-asserted-by":"publisher","DOI":"10.1023\/B:RUCB.0000041307.58649.9b"},{"key":"e_1_2_7_41_2","doi-asserted-by":"publisher","DOI":"10.1246\/cl.2001.1102"},{"key":"e_1_2_7_42_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja012389b"},{"key":"e_1_2_7_43_2","unstructured":"Ishida S.;Iwamoto T.;Kabuto C.;Kira M.Silicon ChemIn press."},{"key":"e_1_2_7_44_2","doi-asserted-by":"publisher","DOI":"10.1038\/nature01380"},{"key":"e_1_2_7_44_3","unstructured":"(b)Iwamoto T.;Masuda H. T.;Kabuto C.;Kira M.to be published."}],"container-title":["The Chemical Record"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.wiley.com\/onlinelibrary\/tdm\/v1\/articles\/10.1002%2Ftcr.20019","content-type":"unspecified","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/pdf\/10.1002\/tcr.20019","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2023,10,16]],"date-time":"2023-10-16T07:37:27Z","timestamp":1697441847000},"score":1,"resource":{"primary":{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/10.1002\/tcr.20019"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2004,1]]},"references-count":47,"journal-issue":{"issue":"4","published-print":{"date-parts":[[2004,1]]}},"alternative-id":["10.1002\/tcr.20019"],"URL":"https:\/\/doi.org\/10.1002\/tcr.20019","archive":["Portico"],"relation":{},"ISSN":["1527-8999","1528-0691"],"issn-type":[{"value":"1527-8999","type":"print"},{"value":"1528-0691","type":"electronic"}],"subject":[],"published":{"date-parts":[[2004,1]]},"assertion":[{"value":"2004-06-10","order":0,"name":"received","label":"Received","group":{"name":"publication_history","label":"Publication History"}},{"value":"2004-06-18","order":1,"name":"accepted","label":"Accepted","group":{"name":"publication_history","label":"Publication History"}},{"value":"2004-08-25","order":2,"name":"published","label":"Published","group":{"name":"publication_history","label":"Publication History"}}]}}