✦ LIBER ✦

Photocyclodimerization of 5-Methyl-2H-pyran-3(6H)-one

✍ Scribed by Ljubov Groesch; Jürgen Kopf; Paul Margaretha

Publisher: John Wiley and Sons
Year: 2008
Tongue: German
Weight: 165 KB
Volume: 91
Category: Article
ISSN: 0018-019X
DOI: 10.1002/hlca.200890239

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

The structures of the main products resulting from photocyclodimerization of the title compound 2 and of other 3‐methyl‐substituted ‘oxacyclohex‐2‐en‐1‐ones’ (=dihydropyranones) were determined by X‐ray crystallography. In connection, the ^13^C‐NMR chemical shifts of the cyclobutane C‐atoms of these dimers allow a clear differentiation between head‐to‐head and head‐to‐tail regioisomers, all structurally related to those of isophorone (1).

📜 SIMILAR VOLUMES

ChemInform Abstract: 5-(Trimethylstannyl

ChemInform Abstract: 5-(Trimethylstannyl)-2H-pyran-2-one and 3-(Trimethylstannyl)-2H-pyran- 2-one: New 2H-Pyran-2-one Synthons.

✍ Z. LIU; J. MEINWALD 📂 Article 📅 2010 🏛 John Wiley and Sons ⚖ 36 KB 👁 2 views

## Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable v

ChemInform Abstract: 3-Aryl and 5-Aryl-4

ChemInform Abstract: 3-Aryl and 5-Aryl-4-methoxy-6-methyl-2H-pyran-2-ones by Suzuki Cross-Coupling Reactions of 3- and 5-Halogeno-4-methoxy-6-methyl-2H-pyran-2-ones.

✍ S. CEREZO; M. MORENO-MANAS; R. PLEIXATS 📂 Article 📅 2010 🏛 John Wiley and Sons ⚖ 34 KB 👁 1 views

Photochemistry of 6,6-Dimethyl- and 2,2,

Photochemistry of 6,6-Dimethyl- and 2,2,6,6-Tetramethyl-2H,6H-pyran-3-one

✍ Erhan Er; Paul Margaretha 📂 Article 📅 1994 🏛 John Wiley and Sons 🌐 German ⚖ 254 KB 👁 1 views

## 2 , : 'H-NMR (CDCI,): 5.93 (dd, J = 10.7. 1.5); 5.67 6a. 7.7,8,octun-S-oiir @a): 'H-NMR (CDCI,): 3.98, 3.78 ( A R , . 0 ] o l l a l r (9a): ' H-N MR (CDCI,) : 4.02, 3.65 (.4 R, -c/io.~-aspiro~3.5/nori-X-i~.nr~ (7b): 'H-NMR (CDCI,): 6.04 (d, J = 10.4); 5.63 (d, ( d , J = 10.7);4.I0(dd,J=11.7,1.

ChemInform Abstract: Remarkable O2-Effec

ChemInform Abstract: Remarkable O2-Effect in 1,4-Additions of Diethylzinc to 6-Acyloxy-2H-pyran-3(6H)-ones and 6-Alkoxy-2H-pyran-3(6H)-ones.

✍ Hanneke van der Deen; Richard M. Kellogg; Ben L. Feringa 📂 Article 📅 2000 🏛 John Wiley and Sons ⚖ 30 KB 👁 1 views

ChemInform Abstract: Synthesis of 7-Meth

ChemInform Abstract: Synthesis of 7-Methoxy-3′,4′,5′,6′-tetrahydrospiro [isobenzofuran-1(3H),2′-pyran]-3-one and 5,7-Dimethoxy-3′,4′,5′,6′-tetrahydrospiro [isobenzofuran-1(3H),2′-pyran]-3-one.

✍ M. A. BRIMBLE; S. H. CHAN 📂 Article 📅 2010 🏛 John Wiley and Sons ⚖ 34 KB 👁 1 views

The thermal decomposition of 4-methyl-3,

The thermal decomposition of 4-methyl-3,6-dihydro-2H-pyran

✍ Henry M. Frey; Hugo P. Watts 📂 Article 📅 1981 🏛 John Wiley and Sons 🌐 English ⚖ 223 KB 👁 1 views

## Abstract The thermal decomposition of the title compound has been studied in the gas phase in the temperature range of 584–634 K. The decomposition was found to be a first‐order homogeneous process yielding 2‐methylbuta‐1,3‐diene and formaldehyde. The rate constants obtained at 11 temperatures w