Showing papers by "Shiro Kobayashi published in 1982"
42 citations
24 citations
TL;DR: In this article, a clean reaction of the reduction of poly[P-phenyl)tri-methylenephosphine oxide (2) to poly[(P)-trimethylene-phosphine (3) has been found, in which 2 was treated first with oxalyl chloride and then with diisobutylaluminum hydride.
Abstract: A clean reaction of the reduction of poly[(P-phenyl)tri-methylenephosphine oxide](2) to poly[(P-phenyl)trimethylene-phosphine] (3) has been found, in which 2 was treated first with oxalyl chloride and then with diisobutylaluminum hydride. These two reactions were carried out in sequence in one-pot. The complete conversion was observed in both reactions, and the structure of the product 3 was clean. The same procedure was applied to diethylphenylphosphine oxide to produce the corresponding phosphine in an almost quantitative yield.
14 citations
TL;DR: Acyclic and cyclic (SAn and GAn) carboxylic anhydrides were added at room temperature to the C=N bond of unsubstituted cyclic imidates of 2-oxazoline (OZO) and 5,6-dihydro-4H-1,3-oxazine (OZI) to give addition products quantitatively.
Abstract: Acyclic and cyclic (SAn and GAn) carboxylic anhydrides were added at room temperature to the C=N bond of unsubstituted cyclic imidates of 2-oxazoline (OZO) and 5,6-dihydro-4H-1,3-oxazine (OZI) to give addition products quantitatively. In contrast to these findings, the reactions of acetyl halides with OZO and OZI yielded ringopened products and the reactions of carboxylic anhydrides with 2-benzyl-2-oxazoline (BzOZO) afforded also the ring-opened products. The bicyclic addition product of OZO with SAn is equilibrated with a mixture of starting materials. The stereochemistry of addition products having a six-membered ring system is discussed.
7 citations
TL;DR: In this article, 2-Phenyl-1,3,6,2-trioxaphosphocane was copolymerized with α,s-unsaturated acids and with α-keto acids.
Abstract: 2-Phenyl-1,3,6,2-trioxaphosphocane(1), an eight-membered cyclic phosphonite, was copolymerized withα,s-unsaturated acids and with α-keto acids. The copolymerization took place above room temperature without added catalyst. The copolymerizations of1 with α,s-unsaturated acids of acrylic and methacrylic acids (2) afforded polyphosphinates (3), alternating copolymers of1 and2. On the other hand, the combinations of1 with α-keto acids of pyruvic and phenylglyoxylic acids (5) gave copolymers (6) consisting of alternating unit6α and α-ester unit6s formed via the deoxygenation of5 by1 (“Deoxy-Copolymerization”).
5 citations
3 citations
TL;DR: In this paper, a new reaction of glyoxylic acid (2) with 3 to give C-AOPs (5) having no substituent at the C-3 position.
3 citations
TL;DR: Acyclic and cyclic (SAn and GAn) carboxylic anhydrides were added at room temperature to the C=N bond of unsubstituted cyclic imidates of 2-oxazoline (OZO) and 5,6-dihydro-4H-1,3-oxazine (OZI) to give addition products quantitatively as mentioned in this paper.
Abstract: Acyclic and cyclic (SAn and GAn) carboxylic anhydrides were added at room temperature to the C=N bond of unsubstituted cyclic imidates of 2-oxazoline (OZO) and 5,6-dihydro-4H-1,3-oxazine (OZI) to give addition products quantitatively. In contrast to these findings, the reactions of acetyl halides with OZO and OZI yielded ringopened products and the reactions of carboxylic anhydrides with 2-benzyl-2-oxazoline (BzOZO) afforded also the ring-opened products. The bicyclic addition product of OZO with SAn is equilibrated with a mixture of starting materials. The stereochemistry of addition products having a six-membered ring system is discussed.