Acetylation reaction of polytetramethylene glycol with acetic anhydride in pyridine
✍ Scribed by Zhen Ge; Xingyuan Zhang; Jiabing Dai; Weihu Li; Jing Chao; Linlin Feng
- Publisher
- John Wiley and Sons
- Year
- 2007
- Tongue
- English
- Weight
- 231 KB
- Volume
- 104
- Category
- Article
- ISSN
- 0021-8995
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The reaction products of photolysis of acetic anhydride in gas phase at 25"C, where He or C 0 2 was present as buffer gas, were analyzed by gas chromatography. The extent of photodissociation was 52% 2 5% and the extent of intramolecular hydrogen transfer reaction producing acetic acid and ketene wa
## Abstract Attempts to convert 3β‐acetoxy‐5,19‐__cyclo__‐pregna‐6,20‐dione (8) into a cyclocitrinol‐related steroid with a bicyclo[4.4.1]‐undecane AB‐ring substructure through a Lewis acid‐assisted fragmentation failed. Instead, treating 8 with an excess of Ac~2~O and BF~3~·Et~2~O afforded B‐__hom