Tetramethyl tert-butylcalix[4]arene tetraketone
نویسندگان
چکیده
منابع مشابه
Tetramethyl lead absorption: a report of human exposure to a high level of tetramethyl lead.
Accidental human exposure to a high level of tetramethyl lead is described. Tetramethyl lead is blended with petrol as an antiknock agent, and it has similar physical properties to tetraethyl lead. The patient had high levels of lead in urine, averaging 4-75 mumol (983 mug) daily for the first four days after exposure and he continued to have raised levels of urinary lead for six months. He had...
متن کاملCrystallography and magnetism of radicals with hindered hydroxyl groups: 2-(3,5-di-tert-butyl-4-hydroxyphenyl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazole-3-oxide-1-oxyl and 2-(3,5-di-tert-butyl-4-hydroxyphenyl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazole-1-oxyl.
Radicals form networks of OH... ON and OH...Me(nitroxide) interactions. In 2, a frustrated network forms with insufficient N-O units to form extended chain interactions. The magnetism of 1 fits a 1-D Heisenberg model with J/k=-25 J mol(-1), while 2 shows more complex exchange behaviour consistent with its disordered crystal lattice.
متن کاملtert-Butoxytriphenylsilane
The title compound, C(22)H(24)OSi or Ph(3)SiO(t)Bu, shows a distorted tetra-hedral coordination sphere around the Si atom. The C-O-Si angle is 135.97 (12)° and the O-Si distance is 1.6244 (13) Å. The mol-ecules are held together by weak inter-actions only. An H⋯H distance of 2.2924 (7) Å is found between aryl H atoms and is the shortest inter-molecular distance in the structure. With regard to ...
متن کاملSurface Reactions of 3,3',5,5'-tetramethyl Benzidine on Hectorite
-The adsorption and oxidation of 3,3',5,5'-tetramethyl benzidine (TMB) on hectorite has been investigated using X-ray powder diffraction, ultraviolet-visible spectroscopy, electron spin resonance, and infrared spectroscopy. The molecule adsorbed by cation exchange at low adsorption levels and oxidized to the monomeric radical cation (yellow). At higher adsorption levels, intercalation of TMB oc...
متن کامل(R)-N-{2-tert-Butyl-2-[(R)-tert-butylsulfonamido]ethylidene}-tert-butanesulfonamide
The title compound, C(14)H(30)N(2)O(2)S(2), is the product of the monoaddition reaction of tert-butyl magnesium chloride with bis-[(R)-N-tert-butanesulfinyl]ethanediimine. There are two almost identical mol-ecules in the asymmetric unit, the mol-ecular conformation of which is stabilized by an intra-molecular N-H⋯N hydrogen bond.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Acta Crystallographica Section C Crystal Structure Communications
سال: 1993
ISSN: 0108-2701
DOI: 10.1107/s0108270192010515