References
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- Egan , W. , Govil , G. , Sharpless , N. and Zon , G. private communication
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- Takosagawa , F. and Jacobson , R. A. 1978 . Acta Crystallog. , B34 : 213
- Main , P. M. , Woolfson , M. M. and Germain , G. 1971 . A Computer Program for the Automatic Determination of Crystal Structures , York, , England : Department of Physics, University of York . MULTAN:
- Lapp , R. L. and Jacobson , R. A. ALLS, A Generalized Crystallographic Least Squares Program U.S. , Ames, Iowa 50010 : Ames Laboratory, DOE, Iowa State University . Department of Energy Report IS‐4708‐UC‐4
- Boyd , V. L. , Zon , G. , Himes , V. L. , Stalick , J. K. , Mighall , A. D. and Secor , H. V. 1980 . J. Med. Chem. , 23 : 372
- Bartczak , T. J. , Christensen , A. , Kinas , R. and Stec , W. J. 1976 . Cryst. Struct. Comm. , 5 : 21
- Verkade , J. G. 1975 . Phosphorus and Sulfur , 2 : 251
- Bartczak , T. J. , Christensen , A. , Kinas , R. and Stec , W. J. 1975 . Cryst. Struct. Comm. , 4 : 701 This geometry is also closely realized in the related systems 10, and 11 (A. Grand, J. B. Robert and A. Filhol, Acta Crystallogr., B33, 1526 (1977)).
- Cameron , T. S. and Karolak‐Wojciechowska , J. 1977 . Acta Crystallogr. , B33 : 2342 It should be noted that a CNH moiety has a considerable tendency to be axial despite the absence of an equatorial group on the ring. Thus not only the S(—) enantiomer of 2 is consistent with this no‐tion but the same is true for compounds 12, and 13 (T. S. Cameron, Z. Galdecki and J. Karolak‐Wojciechowska, Acta Crystallogr., B32, 492 (1976). In all three cases, however, the plane defined by the nitrogen and its pendant atoms is twisted away from coplanarity with the O=P—N plane suggesting the presence of prohibitively large syn‐1,3‐diaxal interactions even with the N—H hydrogen
- Johnson , C. A. 1971 . ORTEP‐II, A Fortran Thermal‐Ellipsoid Plot Program for Crystal Structure Illustrations , Oak Ridge, Tenn. : Oak Ridge National Laboratory . U.S. Atomic Energy Commission Report ORNYL‐3794, Second Revision with Supplemental Instructions