Quantitative structure-activity relationships of insecticidal pyrazolines
作者:Riaz Hasan、Keiichiro Nishimura、Tamio Ueno
DOI:10.1002/ps.2780420406
日期:1994.12
AbstractMethyl 3‐(4‐chlorophenyl)‐4‐methyl‐1‐[N‐(4‐substituted pheny1)carba‐moy1]‐2‐pyrazoline‐4‐carboxylates and related compounds were prepared. Their convulsant activity was determined as the minimum dose required to bring about the symptom within 1 h after injection against male adult American cockroaches, Periplaneta americana (L.). Insecticidal activity with metabolic inhibitors for oxidation and hydrolysis was measured 24 h after injection of the test compounds. Variations in each of the activities were analysed by using physicochemical substituent parameters and regression analysis. The findings indicated that the greater the hydrophobicity and the more the electron‐withdrawing property of the substituents, the higher were the activities. Variations in each of the two activities were parabolically related to the STERIMOL width parameter with an optimum value of about zero.
Comparison of Base‐Promoted and Self‐Catalyzed Conditions in the Synthesis of Isocyanates from Amines Using Triphosgene
作者:Yiannis C. Charalambides、Stephen C. Moratti
DOI:10.1080/00397910601055156
日期:2007.3.1
Comparison of base-promoted and self-catalyzed conditions for the synthesis of isocyanates from amines and triphosgene shows no advantage in using an amine base in the majority of cases. The workup and isolation of the product is simplified under base-free conditions. Yields of between 50 and 90% after distillation were common. Only acid-sensitive substrates need a base catalyst.
Benes; Szocsova; Phuong Mai, Pharmazie, 1992, vol. 47, # 10, p. 797 - 798