Amine-Linked N-Heterocyclic Carbenes: The Importance of an Pendant Free-Amine Auxiliary in Assisting the Catalytic Reaction
作者:Chia-Yi Li、Yi-Yin Kuo、Jie-Hong Tsai、Glenn P. A. Yap、Tiow-Gan Ong
DOI:10.1002/asia.201000829
日期:2011.6.6
amine group, leading to insight about the instability of NHCs arising from the intermolecular interaction of the dangling amine side‐arm. However, the pendant amine plays an important role with respect to the catalytic process, resuscitating the catalytic activity of unsaturated NHC’s through a synergistic effect invoked by the secondary amine. This proof of concept allows us to expand the spectrum of
Triaryl-1,3,5-triazinane-2,4,6-triones (Isocyanurates) Peripherally Functionalized by Donor Groups: Synthesis and Study of Their Linear and Nonlinear Optical Properties
The linearoptical (LO) and nonlinearoptical (NLO) properties of a series of isocyanuratesfunctionalized by donor arms at the periphery are reported herein. These octupolar derivatives were obtained in a straightforward way from commercial isocyanate derivatives and were fully characterized. Although several of these compounds are known, those that exhibited the largest NLO activities are all new
Cyclic tetramers of a five-membered palladacycle based on a head-to-tail-linked isocyanate dimer and their reactivity in cyclotrimerization of isocyanates
作者:Seon Gye Lee、Keun-Young Choi、Yong-Joo Kim、SuJin Park、Soon W. Lee
DOI:10.1039/c5dt00534e
日期:——
Reactions of [Pd(styrene)(PR3)2], generated from trans-[PdEt2(PR3)2] and styrene, with 2 equiv. of benzyl isocyanate in THF at room-temperature afforded unusual cyclic Pd-tetramers of five-membered rings consisting of organic isocyanatedimers and palladium, [Pd(PR3)–C(O)N(R)C(O)N(R)–}]4 (PR3 = PMe3, 1; PR3 = PMe2Ph, 2). Additionally, a cyclic trimer, (RNCO)3, 3 (R = benzyl) was produced as a catalytic
Reactivities of zero-valent group 10 complexes toward organic isocyanates: synthesis of metallacycles containing dimeric isocyanate units, isocyanate cyclotrimerization, and computational chemistry
作者:Young-Sung Han、Kang-Yeoun Jung、Yong-Joo Kim、Kyoung Koo Baeck、Gang Min Lee、Soon W. Lee
DOI:10.1039/c9nj03332g
日期:——
4-methoxybenzyl), depending on the alkyl substituent on R-NCO. Interestingly, these reactions afford cyclic trimers as catalytic products when two equivalents or excess amounts of benzyl isocyanate are used. In contrast, reactions of [Pt(olefin)(PR3)2] with two equivalents of an alkyl or aryl isocyanate afford only the five-membered platinacycle, namely cis-[Pt–N(R)C(O)N(R)C(O)–}(PMe3)2] (R = 3-methylbenzyl
Macrocyclic complexes containing a platinacycle or palladacycle composed of an isocyanate dimer unit: Reactivity towards isocyanides and cyclotrimerization of isocyanates
作者:Jun-Hwan Choi、Kang-Yeoun Jung、Yong-Joo Kim、Hye Jin Im、Soon W. Lee
DOI:10.1016/j.poly.2016.05.061
日期:2016.10
cyclic products as an assembly of four platinacycles or palladacycles, [M(PR3)–N(R)C(O)N(R)C(O)–}]4, were readily obtained. These cyclic tetramers were cleaved using tert-butyl isocyanide (CN–tbutyl, 4 equiv.), affording the corresponding monomeric complexes, [M(PR3)(CN–tbutyl)–N(R)C(O)N(R)C(O)–}] (M = Pt, Pd). An unusual cyclotrimerization of organic isocyanates catalyzed by zerovalent Pt complexes