Group V Derivatives

Group V Derivatives. A fibrous titanium nitride has been prepared by spark discharge through a vapour mixture of TiX4 (X = Cl or Br), H2, N2, and an amine the effects of temperature and composition of TiCl4-H2-N2 mixtures on the rate of deposition 

TiN reacts with NiO in the range 1473—1773 K to give metallic Ni, titanium oxides, and 

Red phosphorus and Ti powder heated at 753—823 K for 12 h yield TiPj, which decomposes to TiP above 1073 K TiP2 can also be obtained from TiP and red phosphorus.  

TiSbj has been prepared and its structure and properties investigated.  

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The position of iodosilane and iodotrimethylsilane in the heavy salt conversion series1,2 is such that iodosilane and its methylated analogues may be used as sources for the [(CH3) SiH3. ] - (n = 0-3) groups in the preparation of a wide variety of silicon halides 3 pseudohalides, 6 chalcogenides,s,7,s and group V derivatives.9... 

The 1,6-, or bridgehead, carbon atoms in the beautifully symmetric molecule (I) can theoretically be substituted with any elements capable of (roughly) tetrahedral coordination, the most likely candidates being in Groups III, IV, V, and VI of the periodic table (see Fig. 1). The problem of their study is almost entirely one of synthesis, not stability. Although the first member of the series, 1,6-diazatriptycene (II), was apparently synthesized more than 100 years ago, (J) progress has been slow because only the 1,-6-diarsatriptycene skeleton can be built up in a stepwise fashion from stable intermediates (2). Special techniques must be devised for the other triptycenes and thus far, with one exception, only Group V derivatives have been synthesized. 

Since the tin heterocycle has been generated by the Grignard method, the exchange reaction can be utilized to convert the tin derivative to either a Group III derivative or a Group V derivative. 

Scheme 7. Substitution reactions at pentavalent Group V derivatives may result in reduction.

The method is not restricted to group V derivatives and can easily be applied to oxygen esters and ethers. The use of various nucleophiles in this type of reaction has been discussed. The main advantage of this technique for the demethylation of ethers with ethanethiolate in a solvent such as DMF is that a relatively low temperature is required and the group R may be acid sensitive. ... 

Several cyclopentadienyl derivatives of Group IV elements have long been known to behave as fluxional molecules. Now F n.m.r. spectroscopy of P(A -C5H5)F2 shows that this Group V derivative is also a fluxional molecule. No quantitative kinetic data were quoted, but a qualitative impression can be... 

It is convenient to consider the indiflferent or neutral oxygen derivatives of the hydrocarbons—(a) aldehydes and kelones, (b) esters and anhydrides, (c) alcohols and ethers—together. All of these, with the exception of the water-soluble members of low molecular weight, are soluble only in concentrated sulphuric acid, i.e., fall into Solubility Group V. The above classes of compounds must be tested for in the order in which they are listed, otherwise erroneous conclusions may be drawn from the reactions for functional groups about to be described. 

In addition to the mono- and dialkylamines, representative stmctures of this class of surfactants include /V-alkyltrimethylene diamine, RNH(CH2)3NH2, where the alkyl group is derived from coconut, tallow, and soybean oils or is 9-octadecenyl, 2-aLkyl-2-imidazoline (3), where R is heptadecyl, heptadecenyl, or mixed alkyl, and l-(2-aniinoethyl)-2-aLk5l-2-imidazoline (4), where R is heptadecyl, 8-heptadecenyl, or mixed alkyl. 

The diazaphosphane or aminoiminophosphane ligands with a NPN framework are another subclass of cyclophosphazenes. These compounds with both phosphorus in oxidation state (111) [104-110] and (V) [111-112] have been employed in the synthesis of four membered heterocycles and coordination chemistry with group 13 derivatives. Several complexes of trivalent phosphorus derivatives with both aluminum halide and alkyls are known as illustrated for 48 in Scheme 21 [113-119]. The structure determination of 48 confirms the formation of a four membered metallacycle [116, 117],... 

In hydrogenation, early transition-metal catalysts are mainly based on metallocene complexes, and particularly the Group IV metallocenes. Nonetheless, Group III, lanthanide and even actinide complexes as well as later metals (Groups V-VII) have also been used. The active species can be stabilized by other bulky ligands such as those derived from 2,6-disubstituted phenols (aryl-oxy) or silica (siloxy) (vide infra). Moreover, the catalytic activity of these systems is not limited to the hydrogenation of alkenes, but can be used for the hydrogenation of aromatics, alkynes and imines. These systems have also been developed very successfully into their enantioselective versions. 

VI. Metal Complexes of Tertiary Derivatives of Group V Elements Containing Several Olefinic Groups... 

Recently an arsenic amide derivative has reacted with an isocyanate, adding across the carbon—nitrogen double bond. I think this is the first example of a group V element which seems to be undergoing an insertion reaction. 

Ammino-derivatives op Subgroup B—Derivatives of Tin Halides, Lead Halides. Chapter VIII. Metal - Ammines of Elements of Group V. 

The polymerization of substituted alkynes is postulated to proceed either by the metathesis mechanism or by an insertion mechanism (18). Numerous alkyne derivates have been shown to polymerize in the presence of group V, VI, and VIII transition metal catalysts. 

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