74079-01-9Relevant articles and documents
Effects of spin diffusion on spin-lattice relaxation in solid-state 2H MAS NMR spectroscopy
Cutajar, Marica,Lewis, Moira H.,Wimperis, Stephen
, p. 86 - 91 (2007)
Recently, there has been increased interest in using 2H MAS NMR spectroscopy as an alternative to 'static' quadrupolar-echo NMR for studying dynamics in solids. Here we show that the phenomenon of enhanced spin diffusion as a result of n = 0 rotational resonance can lead to observation of a common spin-lattice (T1) relaxation time for all deuterons. Thus, if rapidly relaxing groups are present, such as -CD3 or - ND3+ groups, then even highly immobile deuterons can exhibit T1 relaxation times of ～1 s under MAS conditions, greatly facilitating data acquisition.
Novel Transannular Reactions in the Acid Hydrolysis of Diazotized syn- and anti-4-Amino(1,4)naphthalenoparacyclophanes
Takada, Yoshihiro,Tsuchiya, Kazuhiko,Takahashi, Senji,Mori, Nobuo
, p. 2141 - 2145 (2007/10/02)
The diazonium ions derived from the title syn- and anti-4-aminocyclophanes 1a und 4a in aqueous solution undergo transannular reactions to give 17-hydroxy(1,4)naphthalenoparacyclophane 3a and 9,10-dihydro-1,9:4,10-diethano-9,10-ethenoanthracene 6a, respectively.Deuterium-tracer experiments suggest that the reaction of diazotized 1a proceeds via a pathway involving tranannular diazo coupling followed by generation of a 16,17-didehydro intermediate.On the other hand, the reaction pathway of diazotized 4a involves dediazonization followed by transannular electrophilic addition.
