{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,1]],"date-time":"2026-10-01T09:37:55Z","timestamp":1790847475286,"version":"4.1.0"},"reference-count":48,"publisher":"American Chemical Society (ACS)","issue":"39","license":[{"start":{"date-parts":[[2024,9,16]],"date-time":"2024-09-16T00:00:00Z","timestamp":1726444800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100002367","name":", Chinese Academy of Sciences","doi-asserted-by":"publisher","award":["XDA"],"award-info":[{"award-number":["XDA"]}],"id":[{"id":"10.13039\/501100002367","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2024,10,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>Dimethyl hexane-1,6-dicarbamate (HDC), the vital intermediate for nonphosgene production of hexamethylene-diisocyanate (HDI), was effectively synthesized via carbonylation of 1,6-hexanediamine (HDA) using methyl carbamate (MC) as a carbonyl source over a silanol-rich MCM-41 catalyst. The effects of reaction conditions, including the reaction temperature, molar ratio of raw materials, methanol dosage, catalyst dosage, and reaction time, on the HDC yield were evaluated. Under the reaction conditions with a reaction temperature of 190 \u00b0C, a molar ratio of HDA, MC, and methanol of 1:6:50, a catalyst dosage of 10 wt %, and a reaction time of 3 h, the yield of HDC can reach as high as 92.6% with 100% HDA converted. Characterizations based on N2 physical adsorption\/desorption, scanning electron microscopy (SEM), X-ray diffractometry (XRD), NH3-temperature-programmed desorption (TPD), Fourier transform infrared spectroscopy (FTIR), and 1H magic-angle spinning (MAS) NMR indicated that the abundance of silanol groups on the surface of MCM-41 probably resulted in the good performance of MCM-41. After five cycles of MCM-41, the HDC yield decreased from 92.6 to 67.9%, probably due to the loss of surface silanol groups and the carbon deposition on the catalyst as well as the particle agglomeration. The study on the substrate scope suggested that MCM-41 shows good-to-excellent catalytic performance in the synthesis of a variety of aliphatic and alicyclic dicarbamates.<\/jats:p>","DOI":"10.1021\/acsomega.4c03437","type":"journal-article","created":{"date-parts":[[2024,9,16]],"date-time":"2024-09-16T14:01:55Z","timestamp":1726495315000},"page":"40485-40495","source":"Crossref","is-referenced-by-count":4,"title":["Synthesis of Dimethyl\nHexane-1,6-dicarbamate with\nMethyl Carbamate as Carbonyl Source over MCM-41 Catalyst"],"prefix":"10.1021","volume":"9","author":[{"given":"Junya","family":"Cao","sequence":"first","affiliation":[{"name":"China University of Mining & Technology (Beijing) , , ,","place":["Beijing, China, 100083"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Liyan","family":"Zhao","sequence":"additional","affiliation":[{"name":"Institute of Process Engineering, Chinese Academy of Sciences , , ,","place":["Beijing, China, 100190"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaoxuan","family":"Wang","sequence":"additional","affiliation":[{"name":"China University of Mining & Technology (Beijing) , , ,","place":["Beijing, China, 100083"]},{"name":"Institute of Process Engineering, Chinese Academy of Sciences , , ,","place":["Beijing, China, 100190"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shuang","family":"Xu","sequence":"additional","affiliation":[{"name":"Institute of Process Engineering, Chinese Academy of Sciences , , ,","place":["Beijing, China, 100190"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yan","family":"Cao","sequence":"additional","affiliation":[{"name":"Institute of Process Engineering, Chinese Academy of Sciences , , ,","place":["Beijing, China, 100190"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1479-8717","authenticated-orcid":true,"given":"Peng","family":"He","sequence":"additional","affiliation":[{"name":"Institute of Process Engineering, Chinese Academy of Sciences , , ,","place":["Beijing, China, 100190"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8509-7950","authenticated-orcid":true,"given":"Liguo","family":"Wang","sequence":"additional","affiliation":[{"name":"Institute of Process Engineering, Chinese Academy of Sciences , , ,","place":["Beijing, China, 100190"]},{"name":"University of Chinese Academy of Sciences , , ,","place":["Beijing, China, 100049"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2024,9,16]]},"reference":[{"issue":"7","key":"2026081708292744500_cit1","doi-asserted-by":"publisher","first-page":"2895","DOI":"10.1021\/jm501371s","article-title":"Organic carbamates in drug design and medicinal chemistry","volume":"58","author":"Ghosh","year":"2015","journal-title":"J. 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Soc."},{"issue":"19","key":"2026081708292744500_cit45","doi-asserted-by":"publisher","DOI":"10.3390\/molecules26195974","article-title":"Surface\nChemistry of Nanohybrids with Fumed Silica Functionalized by Polydimethylsiloxane\/Dimethyl\nCarbonate Studied Using 1H, 13C, and 29Si Solid-State NMR Spectroscopy","volume":"26","author":"Protsak","year":"2021","journal-title":"Molecules"},{"key":"2026081708292744500_cit46","doi-asserted-by":"publisher","DOI":"10.1016\/j.colsurfa.2022.129137","article-title":"Designing\na novel type of multifunctional soil conditioner based on 4-arm star-shaped\npolymer modified mesoporous MCM-41","volume":"648","author":"Li","year":"2022","journal-title":"Colloids\nSurf., A"},{"issue":"4","key":"2026081708292744500_cit47","doi-asserted-by":"publisher","first-page":"261","DOI":"10.1023\/B:CATS.0000008165.80991.05","article-title":"The catalysis of vapor-phase Beckmann\nrearrangement for the production of \u03b5-caprolactam","volume":"7","author":"Ichihashi","year":"2003","journal-title":"Catal. Surv. 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