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2-Methyl-5,6-dihydro-1,4-dithiin and 2-Methyl-6,7-dihydro-5H-dithiepin from 2-Chloroallylthioalkanethiols 1

✍ Scribed by Bottini, Albert T.; Böttner, Ernst F.

Book ID
127145549
Publisher
American Chemical Society
Year
1966
Tongue
English
Weight
314 KB
Volume
31
Category
Article
ISSN
0022-3263

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## Abstract Vilsmeier formylation of the 4‐amino‐2‐pyridinones 4a–d leads to the formation of the corresponding 3‐carbaldehydes 5a–d (the diformylated product 8 is isolated as a by‐product). A cyclizing Knoevenagel reaction of 5 with CH‐acidic nitriles 6 in the presence of piperidine gives substitu