Preparation of derivatives of cyclobutane and cyclobutene
AssigneeShell Oil Company
InventorsJoachim H. Lukas, Frank Baardman, Adriaan P. Kouwenhoven
Life of this patent
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Abstract
Preparation of alkylidenecyclobutane derivatives and of cyclobutene derivatives by contacting a (cyclo)alkene with an allene or with a 1-alkyne in the liquid phase in the presence of a dissolved Lewis acid derived from an element of Group III A of the Periodic Table of the Elements, titanium, tin, antimony, tantalum, rhenium, iron, or zinc.
Claims16
A process for the preparation of an alkylidenecyclobutane derivative having one of the formulas ##EQU6## in which formulas I-IV R.sup.1, R.sup.2, R.sup.3 and R.sup.4 each individually represent a hydrogen atom or alkyl, R.sup.5 and R.sup.8 a primary or secondary alkyl group, R.sup.6 and R.sup.7 a hydrogen atom, a primary or secondary alkyl group, and R.sup.5 and R.sup.6 each individually may represent a hydrogen atom when R.sup.7 represents a primary or secondary alkyl group having at least 2 carbon atoms and R.sup.8 a primary or secondary alkyl group, which process comprises contacting an alkene having the formula
- R.sup.5 R.sup.6 C = CR.sup.7 R.sup.8 (V)
- with an allene having the formula
- R.sup.1 R.sup.2 C = C = CR.sup.3 R.sup.4 (VI)
- R.sup.1, r.sup.2, r.sup.3, r.sup.4, r.sup.5, r.sup.6, r.sup.7 and R.sup.8 in the formulas V-VI having the same meanings as in the formula I-IV, in the liquid phase in the presence of a dissolved Lewis acid derived from an element of Group IIIA of the Periodic Table of the Elements, titanium, tin, antimony, tantalum, rhenium, iron or zinc.
Dependencies are inferred from the claim text.