202059-36-7Relevant academic research and scientific papers
18-Membered cyclic esters derived from glycolide and lactide: Preparations, structures and coordination to sodium ions
Chisholm, Malcolm H.,Gallucci, Judith C.,Yin, Hongfeng
, p. 4811 - 4821 (2007)
From reactions between glycolide or lactide (4 equiv.) with 4-dimethylaminopyridine, DMAP (1 equiv.) and NaBPh4 (1 equiv.) in benzene at 70 °C the cyclic ester adducts (CH2C(O)O) 6NaBPh4 and (CHMeC(O)O)6/s
Reactive Dimerization of an N-Heterocyclic Plumbylene: C?H Activation with PbII
Guthardt, Robin,Oetzel, Jan,Schweizer, Julia I.,Bruhn, Clemens,Langer, Robert,Maurer, Martin,Vícha, Jan,Shestakova, Pavletta,Holthausen, Max C.,Siemeling, Ulrich
, p. 1387 - 1391 (2019)
The N-heterocyclic plumbylene [Fe{(η5-C5H4)NSiMe3}2Pb:] is in equilibrium with an unprecedented dimer in solution, whose formation involves the cleavage of a strong C?H bond and concomitant formation of a Pb?C and an N?H bond. According to a mechanistic DFT assessment, dimer formation does not involve direct PbII insertion into a cyclopentadienyl C?H bond, but is best described as an electrophilic substitution. The bulkier plumbylene [Fe{(η5-C5H4)NSitBuMe2}2Pb:] shows no dimerization, but compensates its electrophilicity by the formation of an intramolecular Fe?Pb bond.
(η3-α-Silabenzyl)tungsten complexes: An isolable intermediate for interconversion between a silylene complex and a silyl complex through 1,2-aryl migration
Suzuki, Eiji,Komuro, Takashi,Kanno, Yuto,Tobita, Hiromi
supporting information, p. 748 - 751 (2013/03/14)
η3-α-Silabenzyl complexes Cp W(CO)2{η 3(Si,C,C)-Si(p-Tol)2R} (1a, R = Me; 1b, R = p-Tol; Cp* = η5-C5Me5, p-Tol = p-tolyl), the first silicon analogues of η3-benzyl complexes, were synthesized by abstraction of DMAP (4-(dimethylamino)pyridine) with BPh3 either from (aryl)(DMAP·silylene)tungsten complexes 2a,b at room temperature or from (arylsilyl)(DMAP)tungsten complexes 3a,b under irradiation. Complex 1 was demonstrated to be a key intermediate for the interconversion between 2 and 3 and to serve as a synthetic equivalent for both base-free silylene complexes and coordinatively unsaturated silyl complexes.
Reactions of tungsten acetylide-silylene complexes with pyridines: Direct observation of silylene/silyl migration in tungsten acetylide and carbyne/vinylidene frameworks
Sakaba, Hiroyuki,Oike, Hiroyuki,Arai, Yasuhiro,Kwon, Eunsang
, p. 8172 - 8177 (2013/02/22)
Reaction of acetylide-silylene complex Cp*(CO)2W(SiPh 2)(CCtBu) (1a) with 4-(dimethylamino)pyridine (DMAP) gave an equilibrium mixture of DMAP-stabilized silylene acetylide complexes trans- and cis-Cp*(CO)2W(SiPh2·DMAP)(CC tBu) (trans-4 and cis-4). The corresponding reaction using Cp*(CO)2W(SiPh2)(CCSiMe3) (2) produced the novel DMAP-coordinated silenylcarbyne/silylvinylidene complex Cp*(CO)2W[CC(SiPh2·DMAP)(SiMe3)] (6a) as a major product, which was equilibrated with trans- and cis-Cp*(CO)2W(SiPh2·DMAP)(CCSiMe 3) (trans-5a and cis-5a) via silylene/silyl migration. The novel structures of cis-4 and 6a were revealed by X-ray crystallography. A mixture of 2 and pyridine exhibited interesting temperature-dependent NMR spectral changes, indicating the formation of trans- and cis-Cp*(CO)2W(SiPh 2·py)(CCSiMe3) (trans-5b and cis-5b) and Cp*(CO)2W[CC(SiPh2·py)(SiMe3)] (6b) at low temperature, while a mixture of 1a and pyridine showed no such spectral changes.
