1,3-Cyclobutanediones (dialkyl ketene dimer) reacted with various aromatic aldehydes to give six-membered cyclic β-keto esters by using a catalytic amount of potassium ethoxide. Effects of alkoxide catalysts and spiro cyclic groups at the 2,4-positions of 1,3-cyclobutanediones were investigated.
The photochemicalringexpansion of dispirosubstitutedcyclobutane-1,3-diones in methanol has been investigated. The formation of ringexpansion product was strongly dependent on the spiro ring size of dispiro substituent. The ring expanded acetal was obtained in a low yield when the spiro ring of dispirosubstitutedcyclobutane-1,3-diones was a five- or seven-membered ring. This is the first example
Ring strain release as a strategy to enable the singlet state photodecarbonylation of crystalline 1,4-cyclobutanediones
作者:Gregory Kuzmanich、Miguel A. Garcia-Garibay
DOI:10.1002/poc.1902
日期:2011.10
is essential to slow down the combination of the intermediate acyl–alkyl biradical back to the starting ketone. Relatively long triplet acyl–alkyl biradical lifetimes give a chance for the loss of CO to occur. Looking for additional strategies to generate transient biradicals in solids, we studied the solid state photochemistry of four aliphatic, dispiro‐substituted 1,4‐cyclobutandiones (1a–d) that
The reaction of 2,2,4,4-tetramethyl-1,3-cyclobutanedione with<i>o</i>-aminophenols,<i>o</i>-aminothiophenol and with aliphatic 2- and 3-hydroxy- and -mercaptoamines
作者:Siegfried Linke
DOI:10.1002/jhet.5570100507
日期:1973.10
Studies of the reaction of the dione dimer of dimethylketene (1) with a series of o-aminophenols and with o-aminothiophenol have been carried out. These reactions give 2-[2-(2,4-dimethyl-3-oxopentyl)]benzoxazoles and -benzothiazole, respectively. Aliphatic 2- and 3-hydroxy- and 2- and 3-mercaptoamines yield 2-substituted 2-oxazolines, 5,6-dihydro-4H-1,3-oxazines, 2-thiazolines and 5,6-dihydro-4H-1
已经进行了二甲基乙烯酮(1)的二酮二聚体与一系列邻氨基苯酚和邻氨基硫基苯酚的反应的研究。这些反应分别得到2- [2-(2,4-二甲基-3-氧戊基)]苯并恶唑和-苯并噻唑。脂肪族的2-和3-羟基-和2-和3-巯基胺产生2-取代的2-恶唑啉,5,6-二氢-4 H -1,3-恶嗪,2-噻唑啉和5,6-二氢-4 H -1,3-噻嗪。
METHOD FOR PRODUCING CYCLOBUTANEDIOL COMPOUND
申请人:JNC CORPORATION
公开号:US20210300847A1
公开(公告)日:2021-09-30
Provided is a process in which a cyclobutanediol compound having a high cis:trans ratio can be stably obtained. The cyclobutanediol compound having a cis:trans ratio of 1.5:1 to 5000:1 is produced by using at least one compound selected from a group consisting of a cyclobutanedione compound, a cyclobutanketol compound, and a cyclobutanediol compound as a raw material, and performing a catalytic hydrogenation reaction and an isomerization reaction in the cyclobutanediol compound in a solid phase state in the presence of a metal catalyst without adding a solvent.