Asymmetric trimethylsilylcyanation of aldehydes utilizing chiral bismuth compounds. A frontier in bismuth mediated synthetic reactions
作者:Makoto Wada、Toshikazu Takahashi、Terutomo Domae、Tomohiro Fukuma、Norikazu Miyoshi、Keith Smith
DOI:10.1016/s0957-4166(97)00570-3
日期:1997.12
found to work efficiently as a versatile catalyst for cyanation of aldehydes with trimethylsilyl cyanide to afford the corresponding cyanohydrins in high yields. Triphenylbismuthan (Ph3Bi) is also effective. The reaction has been applied to the asymmetric cyanation of a variety of aldehydes in high yields with moderate to good enantioselectivities by use of a chiral bismuth catalyst prepared in situ
[EN] METHODS OF CONTROLLING NEONICOTINOID RESISTANT PESTS<br/>[FR] PROCÉDÉS DE LUTTE CONTRE DES ORGANISMES NUISIBLES RÉSISTANT AUX NÉONICOTINOÏDES
申请人:SYNGENTA PARTICIPATIONS AG
公开号:WO2014154488A1
公开(公告)日:2014-10-02
The present invention relates to a method of controlling insects (in particular insects of the order Hemiptera, especially aphids and whitefly) that are resistant to neonicotinoid insecticides, to methods of controlling insects whereby undesired insects are affected but beneficial arthropods are not affected, using compounds of formula (I) (where A, R1 and R2 are as defined above), and, further, to novel compounds of formula (I) which are useful in the aforementioned methods and/or which possess enhanced insecticidal properties, and to compositions containing said compounds.
Catalyst-Free Strecker Reaction in Water: A Simple and Efficient Protocol Using Acetone Cyanohydrin as Cyanide Source
作者:Paola Galletti、Matteo Pori、Daria Giacomini
DOI:10.1002/ejoc.201100089
日期:2011.7
nitriles through a one-pot, three-componentStreckerreaction of a carbonyl compound, amine, and acetone cyanohydrin in water has been developed. Reactions proceed very efficiently without any catalyst at room temperature with high chemoselectivity and give, in some cases, the expected α-amino nitrile pure after direct separation from water. The protocol is particularly efficient for both aliphatic and
A process for producing a calcium carboxylate comprising contacting a nitrile compound, a calcium compound selected from calcium hydroxide, calcium oxide or mixtures thereof, and water at a temperature of about 90°C to about 250°C at a sufficient pressure and for a sufficient time to produce a reaction mixture comprising calcium carboxylate.
A process for producing a calcium carboxylate comprising contacting a nitrile compound, a calcium compound selected from calcium hydroxide, calcium oxide or mixtures thereof, and water at a temperature of about 90° C. to about 250° C. at a sufficient pressure and for a sufficient time to produce a reaction mixture comprising calcium carboxylate.