Die Acyloin-Kondensation von 1,2-Diacyloxyethanen; Gezielte Darstellung unsymmetrisch substituierter 1,2-Bis-(trimethylsiloxy)ethene
摘要:
A synthesis specifically directed to unsymmetrically substituted 1,2-bis-(trimethylsiloxy)ethenes (2a-d), precursors of the corresponding acyloins, was accomplished by intramolecular acyloin condensation of the unsymmetrical 1,2-diacyloxyethanes (1a-d) with sodium in toluene/chlorotrimethylsilane.
Group 4 organometallic reagents. Part 6. The organotin-mediated monofunctionalization of diols: an insight into the selective monoesterification with acyl chlorides
作者:Stefano Roelens
DOI:10.1039/p29880002105
日期:——
The monoesterification of ethylene glycol with acylchlorides through its dibutylstannylene derivative (1) has been selected as a model reaction to investigate, by n.m.r. spectroscopy, the origin of the organotin-mediatedselectivemonofunctionalization of diols. The reaction has been found to take place in two separate steps, namely, an initial fast formation of a stannylated diol monoester followed
Effective management of polyethers through depolymerization to symmetric and unsymmetric glycol diesters using a proton-exchanged montmorillonite catalyst
From the standpoint of Green Sustainable Chemistry, it is very important to build a resource recycling system. Herein, an efficient and practical method for catalytic depolymerization of polyethers to glycol...
and tropone ketal derivatives with singlet oxygen and m-chloroperbenzoic acid was investigated. In most cases furan and furanoid derivatives were isolated. The structures of the formed products were determined by means of spectral data and the formation mechanism of these unusual products is discussed.
Nitrosation () of 1-methyl-2-phenyl-2-imidazoline 8 results in cleavage of only the CN single bond and production of N-(2-methylnitrosaminoethyl)-N-nitrosobenzamide 10. In contrast, 2-phenyl-2-oxazoline 9 nitrosates very rapidly to give products (13–16) derived from a diazonium ion arsing from the exclusive cleavage of the CN.
A photopolymerizable composition comprising a polymer having a radical polymerizable group and a unit represented by the following formula (I) ;
wherein Q1 represents a cyano group or COX2; X1 and X2 each independently represent -R- or a halogen atom, R represents a hetero atom; Ra and Rb each independently represent a hydrogen atom, a halogen atom, a cyano group or an organic residual group; X1 and X2 may be taken together to form a cyclic structure; R1 and Rb may be taken together to form a cyclic structure; and X1 and Ra or Rb may be taken together to form a cyclic structure.