Secondary tertiary

Figure Bl.20.4. Cross-sectional sideview of a syimnetric, tliree-layer interferometer illustrating the origin of primary, secondary, tertiary and gap FECOs. (Reproduced with pennission from [54].)...

It consists in treating a solution of sodium iodide in pure acetone with the organic compound. The reaction is probably of the S 2 type involving a bimolecular attack of the iodide ion upon the carbon atom carrying the chlorine or bromine the order of reactivities of halides is primary > secondary > tertiary and Br > Cl. 

One important experimental fact is that the rate of reaction of alcohols with hydro gen halides increases m the order methyl < primary < secondary < tertiary This reac tivity order parallels the carbocation stability order and is readily accommodated by the mechanism we have outlined... 

The relative reactivity of alcohols increases m the order primary < secondary < tertiary... 

Section 13 18 One of the special techniques for distinguishing carbons according to the number of their attached hydrogens is called DEPT A series of NMR measurements using different pulse sequences gives normal nulled and inverted peaks that allow assignment of primary secondary tertiary and quaternary carbons... 

The most frequently used organocuprates are those m which the alkyl group is pri mary Steric hindrance makes secondary and tertiary dialkylcuprates less reactive and they tend to decompose before they react with the alkyl halide The reaction of cuprate reagents with alkyl halides follows the usual 8 2 order CH3 > primary > secondary > tertiary and I > Br > Cl > F p Toluenesulfonates are somewhat more reactive than halides Because the alkyl halide and dialkylcuprate reagent should both be primary m order to produce satisfactory yields of coupled products the reaction is limited to the formation of RCH2—CH2R and RCH2—CH3 bonds m alkanes... 

For steric reasons the order of alcohol reactivity m the Fischer esterification is CH3OH > primary > secondary > tertiary... 

The small differences m basicity between ammonia and alkylammes and among the various classes of alkylammes (primary secondary tertiary) come from a mix of effects Replacing hydrogens of ammonia by alkyl groups affects both sides of the acid-base equilibrium m ways that largely cancel... 

Alkaline earth metal alkoxides decompose to carbonates, olefins, hydrogen, and methane calcium alkoxides give ketones (65). For aluminum alkoxides, thermal stability decreases as follows primary > secondary > tertiary the respective decomposition temperatures are ca 320°C, 250°C, and 140°C. Decomposition products are ethers, alcohols, and olefins. 

Higher alkoxides, such as tetra(2-ethylhexyl) titanate, TYZOR TOT [1070-10-6], can be prepared by alcohol interchange (transestenfication) in a solvent, such as benzene or cyclohexane, to form a volatile a2eotrope with the displaced alcohol, or by a solvent-free process involving vacuum removal of the more volatile displaced alcohol. The affinity of an alcohol for titanium decreases in the order primary > secondary > tertiary, and... 

A1koxid.es of other alcohols are formed by alcohol exchange. The general stabihty of the alcohols in exchange is primary > secondary > tertiary, although the reaction can be driven in the opposite direction by removal of the more volatile alcohol ... 

MeOH, reagent prepared by heating Bu2SnO and Bu3SnP04, heat 2 h, 90% yield. This method is effective forprimaiy, secondary, tertiary, benzylic. 

Cl3SiH, Et3N, CH2CI2, 4-48 h, 25-80°, 80-95° yield. Primary, secondary, tertiary, allylic, propargylic, orbenzylic derivatives are cleaved by this method. 

Secondary and tertiary processing normally infers material removal processes, e.g. turning, grinding, honing. Adequate machining allowances must be provided for at the primary/secondary processing stage when a secondary/tertiary process is used respectively. 

There is also a less dramatic but consistent trend which reveals that, within each structural class (primary, secondary, tertiary) larger ions are more stable than smaller ones, e.g., r-C4H9 < t-CsH, < The same trend is observed for primary cations. ... 

Polyethylene glycol 4000 primary, secondary, tertiary alcohols as anthracene-urethane denvatives stabilization and enhancement saturated dipping solution in methanol [275]... 

Ewins suggests that deacetylaspidospermine is a secondary-tertiary base, and that aspidospermine is a derivative of a reduced quinoline. 

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