Method of regulating the growth of aquatic weeds with pyridine
申请人:Eli Lilly and Company
公开号:US04116665A1
公开(公告)日:1978-09-26
A method of regulating the growth of submerged and floating aquatic weeds which comprises adding a 3-substituted pyridinemethane, pyridinemethanol, or derivative thereof, to a body of water containing the submerged and floating aquatic weeds to be regulated, in quantities sufficient to regulate the growth of the said submerged and floating aquatic weeds. The disclosure also relates to novel compositions for carrying out the method.
Bisaldolization of aryl alkyl ketones as well as cyclic ketones with paraformaldehyde in the presence of a catalytic amount of l-proline and low concentration of aqueous sodium hydroxide has been developed in excellent yields. Further, these bisaldols are elaborated to the corresponding spirocyclic dioxanes and novel spirocyclic trioxocanes in the presence of p-toluene sulfonic acid. The structures and preferred conformations of these eight-membered spirocyclic 1,3,5-trioxocanes are discussed.
The cation exchange resin-promoted coupling of alkynes with aldehydes: one-pot synthesis of α,β-unsaturated ketones
作者:J.S. Yadav、B.V. Subba Reddy、P. Vishnumurthy
DOI:10.1016/j.tetlet.2008.05.056
日期:2008.7
Alkynes undergo smooth coupling with aldehydes in the presence of Amberlyst-15® at room temperature to produce the corresponding α,β-unsaturated ketones in high yields with E-geometry. The use of an inexpensive, readily available, and recyclable cation exchange resin makes this method quite simple and convenient.