Four species of clearwing moths found in Sakhalin Island July 2021. Pen-nisetia hylaeiformis (Laspeyres, 1801), Sesia yezoensis (Hampson, 1919) and Synanthedon bicingulata (Staudinger, 1887) were collected using synthetic sex pheromones. Females herzi Špatenka et O. Gorbunov, 1992 from inflorescences Eupatorium chinense L. (Asteraceae). is recorded for the fauna island first time. Pennisetia re...

The Staudinger reactions of substituted phosphanes and azides have been investigated by using density functional theory. Four different initial reaction mechanisms have been found. All systems studied go through a cis-transition state rather than a trans-transition state or a one-step transition state. The one-step pathway of the phosphorus atom attacking the substituted nitrogen atom is always...

[reaction: see text] The technique of native chemical ligation enables the total chemical synthesis of proteins. This method is limited, however, by an absolute requirement for a cysteine residue at the ligation juncture. Here, this restriction is overcome with a new chemical ligation method in which a phosphinobenzenethiol is used to link a thioester and azide. The product is an amide with no ...