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However the desired zirconacyclopentatriene could only be obtained in low yield; see:"},{"key":"e_1_2_3_28_2","doi-asserted-by":"publisher","DOI":"10.1007\/s11172-010-0132-1"},{"key":"e_1_2_3_29_2","first-page":"163","author":"Burlakov V. V.","year":"2012","journal-title":"Izv. Akad. Nauk SSSR, Ser. Khim."},{"key":"e_1_2_3_30_2","unstructured":"For the reactions of zirconacyclocumulenes derived from coupling reactions of benzynezirconocenes and 1 3\u2010butadiynes together with either carbamoyl cyanides cyanoformates or aroyl cyanides through different reaction pathways see Ref.\u2005[7c]."},{"key":"e_1_2_3_31_2","unstructured":"CCDC\u2010871681 (4\u2009d adduct containing one molecule of MeOH and two molecules of CH2Cl2) 871684 (4\u2009j MeOH adduct) 871685 (6 C6D6adduct) 871683 (7) 871682 (16\u2009b CHCl3adduct) 871680 (22) and 871686 (25) contain the supplementary crystallographic data for this paper. 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