La structure cristalline et moléculaire du tribenzamide, N(COC₆H₅)₃

Acyclic Twisted Amides

“…N , N -Diacyl activation represents one of the most effective methods for twisting amide bonds (Figure ). − In this class of amides, n N to π* CO conjugation is satisfied by delocalization onto two exocyclic carbonyl groups (cf. single CO, section ), which leads to enhanced geometric distortion dependent primarily on steric and to a lesser extent on electronic properties of the activating group (cf.…”

“…In general, N , N -diacyl activation can be accomplished using N -acyclic activating groups − such as C­(O)­R, where R is an aromatic or heteroaromatic ring ( 3.67 , 3.70 ) or CO 2 R where R is t -Bu group ( 3.78 , 3.80 ); however, more common is the use of cyclic N-activating groups, including heterocycles such as succinimide ( 3.66 , 3.69 , 3.77 ), hydantoin ( 3.68 , 3.71 – 3.72 , 3.74 , 3.76 ), 2,4-thiazolidinedione ( 3.73 ), phthalimide ( 3.75 , 3.91 ), 1,3,5-triazinane-2,4-dione ( 3.79 ), uracil ( 3.81 – 3.83 , 3.85 – 3.87 , 3.89 – 3.90 , 3.94 – 3.96 , 3.99 , 3.101 – 3.103 ), 1,8-naphthalimide ( 3.84 ), thioquinazoline-2,4-dione ( 3.92 ), 1,3,5-triazinane-2,4,6-trione ( 3.93 ), 3-azabicyclo[3.2.1]­octane-2,4-dione ( 3.97 ), 1,2,4-triazine-3,5-dione ( 3.98 ), glutarimide ( 3.100 ), and isoquinoline-1,3-dione ( 3.104 ).…”

Comments onThe rigid-body vibrations of molecules in crystalsby Burns, Ferrier & McMullan (1967)

“…A probable mishandling of the thermal parameters of C(l 1) causing a discrepancy of 0.8a in U °. (Caron, Riche, Pascard-Billy & Gramain, 1977;Caron, Pascard, Agami & Kasakos, 1978;Brisse & Perez, 1976;Nimmo & Lucas, 1976) and has also been cited in text books (e.g. Willis & Pryor, 1975).…”