A characterization of set representable labeled partial 2-structures through decompositions
β Scribed by A. Ehrenfeucht; G. Rozenberg
- Publisher
- Springer-Verlag
- Year
- 1990
- Tongue
- English
- Weight
- 398 KB
- Volume
- 28
- Category
- Article
- ISSN
- 0001-5903
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A synthesis of 13 C, 15 N labeled imidazoles was developed which allows the direct detection of a transient 2,5-endoperoxide at -100Β°C. The endoperoxide was thoroughly characterized by 1 H, 13 C, and 15 N NMR. Upon warming, the endoperoxide decomposes via a series of transient intermediates to 13 CO
## MIL-21 or [Fe III 5Ψx V III x (H 2 PO 4 ) 4 (HPO 4 ) 4 F 4 (H 2 O) 2 , 4(H 2Ψy N+ (CH 2 ) 2 +NH 2Ψy )] was prepared hydrothermally (453 K, autogenous pressure, 3 days) in the presence of ethylenediamine. Its structure was determined by single-crystal X-ray di4raction. MIL-21 is tetragonal (spac