Reactivity of the carbodiphosphorane, (Ph₃P)₂C, towards main group metal alkyl compounds: coordination and cyclometalation

Abstract

The zerovalent carbodiphosphorane, (Ph3P)2C, reacts with Me3Al and Me3Ga to afford the adducts, [(Ph3P)2C]MMe3 (M = Al, Ga), whereas Me2Zn and Me2Mg react to afford mononuclear and dinuclear cyclometalated derivatives.

Di-ortho-beryllated Carbodiphosphorane: A Compound with a Metal–Carbon Double Bond to an Element of the s-Block

“…However, there have been no complexes of s-block metals that contain a metal–carbon double bond even though these elements have become significantly important in recent years. , Because of steric constraints, the previously known beryllium CDP and carbodicarbene (CDC) complexes exhibit a significant torsion along the Be–C axis, which is >40°. − This prevents overlap of the unoccupied p orbital at Be with the remaining lone pair at C and, therefore, impedes the formation of a double dative bond. A related cyclometalated magnesium complex has a smaller torsion angle; however, it exists as a dimer, which results in no unoccupied p orbital at the metal center that could act as an acceptor for the second CDP lone pair . The analogous zinc compound is monomeric, but the bond of the carbodiphosphorane carbon atom to the metal is the longest of the three C–Zn bonds in the molecule.…”

“…The analogous zinc compound is monomeric, but the bond of the carbodiphosphorane carbon atom to the metal is the longest of the three C–Zn bonds in the molecule. This indicates that a single bond is present …”

“…A related cyclometalated magnesium complex has a smaller torsion angle; however, it exists as a dimer, which results in no unoccupied p orbital at the metal center that could act as an acceptor for the second CDP lone pair. 34 The analogous zinc compound is monomeric, but the bond of the carbodiphosphorane carbon atom to the metal is the longest of the three C−Zn bonds in the molecule. This indicates that a single bond is present.…”

“…This indicates that a single bond is present. 34 ■ RESULTS AND DISCUSSION Thus, our approach to generating a double bond containing an element of the s-block was to use beryllium as the most electronegative s-block metal and to enforce significantly smaller torsion angles by directly tethering the metal to two carbon atoms of CDP. To achieve this, we treated carbodiphosphorane 1 with 2 equiv of n-butyllithium.…”

Natural and pyrolysis molecule of Cotoneaster zabelii Schneid

“…According to figs. 1 and 2 shows, you can see two kinds of samples in between 3000-2750 peaks, indicates that northwest Xun son leaves and stems are -CH 3 , wave peak, there may be an alkyl compounds [34,35]. The two samples have wave peaks and peaks between 1600 and 1500, indicating that O-H is present and aldehydes may exist.…”