Bond Average Type Bond Average TypeC(30)-O(2)-Me(l) 117.2 (8) C(7)-C(8)-C(25)-C(26) -16 (2) C(33)-0(3)-Me(2) 116.1 (7) C(9)-C(8)-C(25)-C(26) 166 (1) C(36)-C(35)-C(40) 118.1 (6) 120.0 (24) C-C-Cphenyi C(13)-C(28)-C(29)-C(30) 76 (1) C(35)-C(36)-C(37) 122.3 (7) C(28)-C(29)-C(30)-O(l) 37 (1) C(36)-C(37)-C(38) 116.7 (7) C(28)-C(29)-C(30)-O(2) -142 (1) C(37)-C(38)-C(39) 122.5 (7) C(29)-C(30)-O(2)-Me(l) -179 (1) C(38)-C(39)-C(40) 119.2 (7) C(17)-C(31)-C(32)-C(33) -170 (1) C(39)-C(40)-C(35) 121.2 (7) C(31)-C(32)-C(33)-0(4) -7 (1) C(36)-C(35)-S 121.8 (6) C(31)-C(32)-C(33)-0(3) 174 (1) C(40)-C(35)-S 120.2 (6) C(32)-C(33)-0(3)-Me(2) -175 (1) C(38)-N(S)-0(5) 117.0 (9)C(38)-N(5)-0(6) 118.5 (9) Vector-Plane Angles, deg 0(5)-N(5)-0(6) 124.4 (10) Fe-N(l) 113.9 (3)2.46 C(35)-C(37)-C(38) Fe-N(2) C(35)-C(37)-C(38) Fe-N(3) 105.5 (4) -90.1 (3) Signed Torsion Angles, deg C(35)-C(37)-C(38) C(4)-C(3)-C(22)-C(23) 128 (2) Fe-N(4) -98.6 (3) C(2)-C(3)-C(22)-C(23) -50(2) C(35)-C(37)-C(38)a xhe figure in parentheses following an average value is the larger of that estimated for an individual value from the inverse matrix or on the assumption that the values averaged are from the same population. 6 The notation Ca, Cp, and Cm is that of J. L. Hoard, Science, 174, 1295Science, 174, (1971. c See text for a discussion of long and short Ca-Cp and Cm-Ca bonds.

Several reactions are discussed. In the presence of silver benzoate, triethylamine, and ethanol, 1-( 1,2,3-triphenylcycloprop-2-enyl)-3-diazopropan-2-one ( 1 b) rearranges to two isomers of ethyl ( 1,2-diphenylcyclobut-2-eny1)phenylacetate (6a and b). Thermally, (1,2,3-triphenylcycloprop-2-enyl)acetyl azide (8b) rearranges to the corresponding isocyanate which was trapped with either dimethylamine or ethanol. With ultraviolet light the azide follows a different pathway.