ChemInform Abstract: PYRYLIUM SALTS FORMED BY DIACYLATION OF OLEFINS. XXIII. ISOMERIC ETHYLTRIMETHYLPYRIDINES AND DIMETHYL‐N‐PROPYLPYRIDINES FROM THE DIACETYLATION OF HEXENES AND METHYLPENTENES

Abstract

Das durch Dehydratisierung von Diäthylmethylcarbinol (I) erhältliche Gemisch aus den Olefinen (II) (Hauptprodukt) und (III) ergibt durch Umsetzung mit Essigsäureanhydrid und Perchlorsäure in der Siedehitze oder mit Acetylchlorid und Aluminiumchlorid ein Gemisch aus den Pyryliumsalzen (IV) und (V), aus denen mit Ammoniak Pentamethylpyridin (VI) sowie das Trimethyläthylpyridin (VII) erhalten werden, die sich gaschromatographisch trennen lassen.

A Facile Oxidation and Oxygen Insertion of the Cyclopentadiene Ring by Molecular Oxygen in Solution

“…Purple powder of 4 was obtained also in the same way as 1 , using pentamethyl cyclopentadiene (68 mg, 0.5 mmol) in place of Ph 3 H 3 C 5 , 94% in yield. The structure of the powder was identified by GC/MS and accorded well with the results in the literature …”

Peptide Coupling in the Presence of Highly Hindered Tertiary Amines

“…For model peptides 4 , 6 , and 8 , coupling efficiency for pentamethylpyridine, 12 , was slightly less than for TEMP, and in addition, this liquid base was difficult to handle under ordinary conditions due to its extremely hygroscopic nature. Use of the hydrate itself caused increased loss of configuration relative to the anhydrous amine.…”

Organosulfur compounds. 23. Addition of elemental sulfur to phosphonate carbanions and its application for synthesis of .alpha.-phosphoryl organosulfur compounds. Synthesis of aromatic ketones

“…Soc., Perkin Trans. 1, 2263(1977. 2, R = alkyl; R' = Me, Ph 3, R' = alkyl, aryl route for aromatic ketones, we explored addition of the elemental sulfur to phosphonate carbanions.…”