Preparation and Diels–Alder reaction of carbosilane dendrimer with conjugated diene
✍ Scribed by Chungkyun Kim; Hyeseon Kim; Kyungrae Park
- Book ID
- 108188114
- Publisher
- Elsevier Science
- Year
- 2005
- Tongue
- English
- Weight
- 329 KB
- Volume
- 690
- Category
- Article
- ISSN
- 0022-328X
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1,3-Cyclopentadienes bearing a fluorene in spiro geometry are nonsterically biased dienes, which can be used to probe the facial selectivities of Diels-Alder reactions. Anti preference of spiro dienes (2 and 3) bearing 2-and 4-nitro and 2-methoxy substituents as Diels-Alder dienes is in striking con
## Abstract Theoretical calculations and simple MO considerations predict that a coplanar and spatially close arrangement of double bonds in structures such as tetradehydrodianthracene 1, should both lower the LUMO and raise the HOMO energy of the π system. Thus the reactivity in Diels‐Alder reacti
## Abstract Tetradehydrodianthracene (TDDA; 1) reacts with electronrich dienes such as butadiene, cyclopentadiene and __o__‐quinodimethane under ambient conditions. Only 1:1 products 5–8 were observed even with a large excess of the diene and under drastic conditions (though two strained and highly