Reactions of diazo ketones with activated unsaturated compounds in the presence of gallium trichloride
作者:R. A. Novikov、Yu. V. Tomilov、O. M. Nefedov
DOI:10.1007/s11172-014-0444-7
日期:2014.2
Diazoacetone reacts with methyl acrylate in the presence of anhydrous GaCl3 to give isomeric methyl 2-acetylcyclopropanecarboxylates rather than pyrazolines obtained from diazo esters or by noncatalytic reactions. In a similar reaction, diazoacetophenone yields methyl 2-benzoylcyclopropanecarboxylates, benzoylmethyl acrylate, and benzoylmethyl 2-benzoylcyclopropanecarboxylate via partial transesterification
UV-CROSSLINKED HOT-MELT PRESSURE-SENSITIVE ADHESIVE USED FOR POLYVINYL-CHLORIDE INSULATED ADHESIVE TAPE
申请人:Hebei Yongle Tape Co., Ltd.
公开号:EP3412741A1
公开(公告)日:2018-12-12
The present invention provides a UV-crosslinked hot-melt pressure-sensitive adhesive used for a polyvinyl chloride (PVC) insulation adhesive tape, made by mixing a polymer of vinyl monomers, functional monomers, special soft monomers, and photoinitiators with a tackifying resin and an antioxidant in certain proportions; the composition of the photoinitiator polymer contains a copolymer of one or more polymerizable photosensitive initiators and acrylate monomers, or a mixture of oligomers of one or more polymerizable photosensitive initiators and acrylate high polymers. The PVC adhesive tape made using such a pressure-sensitive adhesive has the advantages of excellent mechanical properties, bonding performance, and resistance to high temperatures, and is energy-saving and environmentally friendly; the present invention overcomes the defect of the prior art that a relatively long thermal oven is needed to volatilize a solvent in the glue when coating a PVC adhesive tape, which is applicable for wrapping and strapping cable bundles in different positions of the body of an automobile, can satisfy the requirement for uses on high temperature-resistant positions of an engine inside the automobile, and reaches a long-term temperature resistance level of 125°C.
Cu(I)-Catalyzed Reductive Aldol Cyclizations: Diastereo- and Enantioselective Synthesis of β-Hydroxylactones
作者:Hon Wai Lam、Pekka M. Joensuu
DOI:10.1021/ol051649h
日期:2005.9.1
Copper bisphosphine complexes catalyze the intramolecular reductive aldol reaction of alpha,beta-unsaturated esters with ketones, affording five-and six-membered beta-hydroxylactones in high stereoselectivities. Utilization of chiral nonracemic bisphosphines render the cyclizations enantioselective.
Potassium fluoride assisted derivatization of carboxylic acids to phenacyl esters for determination by high-performance liquid chromatography
作者:Jack M. Miller、Ian D. Brindle、Stephen R. Cater、Kwok-Hung. So、James H. Clark
DOI:10.1021/ac50064a047
日期:1980.12.1
Srinivasan, C.; Shunmugasundaram, A.; Arumugam, N., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1981, vol. 20, # 6, p. 467 - 470
作者:Srinivasan, C.、Shunmugasundaram, A.、Arumugam, N.