Nickel-Catalyzed Preparations of Functionalized Organozincs
作者:Stephan Vettel、Andrea Vaupel、Paul Knochel
DOI:10.1021/jo960808v
日期:1996.1.1
(X = Br, Cl) via a halogen-zinc exchange reaction. The treatment of terminal alkenes with diethylzinc (neat, 25-60 degrees C) in the presence of Ni(acac)(2) as a catalyst (1-5 mol %) and 1,5-cyclooctadiene (COD) affords the corresponding dialkylzincs via a hydrozincation reaction. Whereas the conversion for simple alkenes bearing a remote functionality reaches 40 to 63%, the hydrozincation of allylic
Synthesis of 1,3-Diynes via Cadiot–Chodkiewicz Coupling of Volatile, in Situ Generated Bromoalkynes
作者:Phil C. Knutson、Haleigh E. Fredericks、Eric M. Ferreira
DOI:10.1021/acs.orglett.8b02975
日期:2018.11.2
A convenient Cadiot–Chodkiewicz protocol that facilitates the use of low molecular weight alkyne coupling partners is described. The method entails an in situ elimination from a dibromoolefin precursor and immediate subjection to copper-catalyzed conditions, circumventing the hazards of volatile brominated alkynes. The scope of this method is described, and the internal 1,3-diyne products are preliminarily
Practical and Safe Procedures for the Preparation of the Lower Homologues of Bromoacetylene
作者:L. Brandsma、H. D. Verkruijsse
DOI:10.1055/s-1990-27069
日期:——
The lower homologues of bromoacetylene, from 1-bromopropyne to 1-bromo-1-hexyne, have been prepared in excellent yield by stirring the alkyne (in the cases of 1-propyne and 1-butyne a dilute solution in high-boiling petroleum ether) with a very concentrated aqueous solution of potassium hypobromite and potassium hydroxide.
Method for Producing Asymmetric Conjugated Diyne Compound and Method for Producing Z,Z-Conjugated Diene Compound Using the Same
申请人:Shin-Etsu Chemical Co., Ltd.
公开号:US20160229829A1
公开(公告)日:2016-08-11
Provided are a method for efficiently producing an asymmetric conjugated diyne from an inexpensive and safe alternative compound to hydroxylamine hydrochloride and a method for producing a Z,Z-conjugated diene compound from the asymmetric conjugated diyne compound thus obtained. More specifically, provided is a method for producing an asymmetric conjugated diyne compound comprising a step of subjecting a terminal alkyne compound (1): HC≡C—Z
1
—Y
1
to a coupling reaction with an alkynyl halide (2) Y
2
—Z
2
—C≡C—X by using sodium borohydride in water and an organic solvent in the presence of a copper catalyst and a base to obtain the asymmetric conjugated diyne compound (3): Y
2
—Z
2
—C≡C—C≡C—Z
1
—Y
1
. In addition, provided is a method for producing a Z,Z-conjugated diene compound by reducing the resulting asymmetric conjugated diyne compound, or the like.
SYNTHETIC NAVEL ORANGEWORM PHEROMONE COMPOSITION AND METHODS RELATING TO PRODUCTION OF SAME
申请人:Thompson Andrew
公开号:US20100099920A1
公开(公告)日:2010-04-22
One or more embodiments of the invention are directed to the synthetic methods for making lepidopteran pheromones including navel orangeworm pheromones. The synthetic methods involve novel, efficient, and environmentally benign steps and procedures.