✍ Scribed by Prof. Dr. Gerhard Koszmehl; Dipl.-Chem. Bodo Bohn
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systems by the single bonds C7-N2 and C8-N1. The three nitrogen-nitrogen bonds are all shorter than the usual single N-N distance of 1.44w110.' *I, and the N2-N4 distance is only slightly longer than the 1.24A expected for a double bond['0,''! A calculation of the best leastsquares plane passing through the atoms forming the fivemembered ring was performed to determine its conformation, and can be represented by the equation 0.4001 xi0.7802V -0.4808~=1.918
The displacements of the five atoms from this plane (with standard deviations in parentheses) are small but significant N1 0.017(5) A C 7 -0.013(6)8, N 2 0.004(5) 4 N3 0.007(5) + C 8 -0.
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Wittig-Horner reagents (1a-e) react with 1,3-dioxo-D 2,␣ -indanmalononitrile (2) to give the phosphonate adducts 3, 4, 5, 6, and 7, respectively. Structural reasoning for the new products was based on compatible analytical and spectral data (IR, 1 H, 31 P NMR, and MS). The mechanism that accounts fo
The Reactions of Wittig-Horner Reagents with 1,3-Dioxo-δ2,αindanmalononitrile. -The reaction of title compound (II) with reagents (Ia)-(Ie) affords different products depending on the nature of the phosphonate and the stability of the addition products. -(BOULOS, L. S.; YAKOUT,