ISSN:
0170-2041
Keywords:
Photochromism
;
Quinone methide
;
Spiroquinole ether
;
Furofurans
;
Quinones
;
Chemistry
;
Organic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Thermochromic Furofuranes, II. - Synthesis and Thermolytic Behavior of Spiroquinole Ethers with Naphthalene NucleusTo obtain further insight into the new photochromic system 2/3, various 3,4-disubstituted spiroquinole ethers 7 have been synthesized by oxidation of 2-alkyl-4-methoxy-1-naphtholes 5 via the corresponding quinone methides 6. Unlike 7a, the ethers 7b-d did not yield dimeric quinone methides or furofuranes (type 2/3) on heating, but decomposed by retro-diene reaction yielding monomeric methides 6. The sterically hindered methides 6e, 6f are stable yellow compounds; 6c rearranged forming 12 which led to the naphthopyranes 11a/11b on further reaction with 6c.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/jlac.1992199201207
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