Carboxylates using

Ethyl cyctopropane-carboxylate. Use 22 g. of cyciopropane-carb-oxyhc acid (Section V,33) and 40 g. (24-5 ml.) of redistiUed thionyl chloride to prepare the acid chloride, b.p. 118-119° (22 g.). Treat the latter with 10-1 g. of absolute ethyl alcohol. The yield of ethyl cyclo-propane-carboxylate, b.p. 132-133°, is 13 g. 

The stereo-defined enol ester 432 is prepared by the reaction of the vinyl-mercurial 431, obtained by acetoxymercuration of 2-butyne. with mercury(II) carboxylates using a catalytic amount of Pd(OAc)2[392]. 

Asymmetric dimerization with cyclopentanone-2-carboxylate using BPPM as a chiral ligand gave the telomer in 41% eefSS]. 

A method for the generation of benzyne involves heating the diazonium salt from o aminobenzoic acid (benzenediazonium 2 carboxylate) Using curved arrows show how this sub stance forms benzyne What two inorganic compounds are formed in this reaction" ... 

Liu XH, Yang ZF, Wang LS. Three-dimensional quantitative structure-activity relationship study for phenylsulfonyl carboxylates using CoMFA and CoMSI A. Chemosphere 2003 53 945-52. 

ASYMMETRIC HYDROGENATION OF 3-OXO CARBOXYLATES USING BINAP-RUTHENIUM COMPLEXES (R)-(-)-METHYL 3-HYDROXYBUTANOATE (Butanoic acid, 3-hydroxy-, methyl ester, (R)-)... 

Figure 1.88 The maleimide group of BMPA reacts with a thiol-containing molecule to result in a modification having a terminal carboxylate group. Amine-containing molecules then can be conjugated to the carboxylate using a carbodiimide reaction with EDC.

Figure 7.12 Amine-containing dendrimers can be modified using a number of common reactive modification agents. Excess amine groups can be blocked using acetic anhydride, glycidol, or an NHS-mPEG compound. Amines also can be converted into carboxylates using succinic anhydride.

The PCBM methyl ester can be used for coupling amine-containing ligands after removal of the methyl group and activation of the carboxylate using a number of different reaction strategies. Hummelen et al. (1995) successfully coupled cholestanol and histamine to the fuller-ene-PCBM derivative (after acid chloride formation) for use in fabrication of photodetectors and biological studies, respectively. For specific applications of PCBM-fullerenes, see Shaheen et al. (2001), Brabec et al. (2001), Yu et al. (1995), Mecher et al. (2002), Meijer et al. (2003), van Duren et al. (2004), and Anthopoulos et al. (2004). 

Dipolar cycloadditions of 2-tert-butoxycarbonyl-1 -pyrroline A -oxide (627) with several chiral acrylamides (634a-f) (Scheme 2.276) followed by hydrogenolysis of cycloadducts (635) and (636) has been used in the synthesis of enantiopure tert-butyl (2RJ R)- and (2.S. 7a.S )-2-hydroxy-3-oxo-tetrahydro-l II -pyrrolizine-7a(5// )-carboxylates, useful intermediates for the synthesis of Gly-(s-cis)Pro dipeptide mimetic (790). 

Smith, 1976. Reference reaction is acetic acid catalysed hydrolysis of benzimidazole. Smith calculates EM = 8 x 104 from this comparison. Correction for the (estimated) lower pAT. of the neighbouring carboxyl using p= 1.7 (Oakenfull and Jencks, 1971) raises this to 4 x 10 M... 

Figure 3 Resolution of the enantiomers of t-butyl-3-oxo-2-thia-5-azabicyclo[2.2.1]heptane-5-carboxylate using a CHIRALPAK AD CSP. (a) S,S-Enantiomer standard artificially enriched with 30%w/w R,R-enantiomer, (b) S,S-enantiomer standard artificially enriched with 0.05%w/w R,R-enantiomer and (c) chrrally pure S,S-enantiomer. (Conditions CHIRALPAK AD-H 15 cm X 0.46 cm i.d. mobile phase methanol at 1 ml/min detection UV at 210 nm column temperature 15°C sample preparation 0.4 mg/ml in methanol injection volume 10 pi.)...

Condensation of the intermediates 146-151 with either ethyl 5-amino-l-methylpyrazole-4-carboxylate or ethyl 2-aminothiophene-3-carboxylate using sodium hydride in refluxing dioxane gave the corresponding 4-hydroxy-l-methyl-pyrazolopyridine or 4-hydroxythienylpyridine esters, respectively (Equation 52 Table 28) <2003BMC2991>. 

Recently it was found that similarly benzyl ic and allylic chlorides can be carboxylated using a cobalt-bis-salicylidene iminato complex (Co(salen)) (Table 6, No. 8)... 

Catalyzing beta carboxylation using HC03 with coupled cleavage of ATP to ADP + P ... 

The fluorination of alkali metal salts of tetrachloropalladate(II) and hexachloropalladate(IV) or mixtures of (NHtJjPdCUl and group II carboxylates using F2, C1F3 or BrF3 gives hexafluoropalladate(IV) salts.309-316... 

Diene Polymers Polymerization of a 1,3-diene yields a polymer having true asymmetric centers in the main chain and ozonolysis of the polymer gives a chiral diacid compound (12) whose analysis of optical purity discloses the extent of chiral induction in the polymerization (Scheme 11.2) [12,35-39], The polymerization of methyl and butyl sorbates methyl and butyl styrylacrylates and methyl, ethyl, butyl, and /-butyl 1,3-butadiene-1-carboxylates using (+)-2-methylbutyllithium, butyllithium/(-)-menthyl ethyl ether, butyllithium/menthoxy-Na, butyllithium/bomeoxy-Na, butyllithium/Ti((-)-menthoxy)4, and butyllithium/bomyl ethyl ether initiators [35-37] and that of 1,3-pentadiene in the presence of... 

Table 7.1 Asymmetric C-benzylation of tert-butyl 2-oxocyclopentane carboxylate using PTCs 12-15.

The nitration of phenylfurans takes place in the furan ring very readily. The nitration of methyl 3,4-diphenylfuran-2-carboxylate using nitric acid acetic anhydride at low temperatures (-40 to 20°C) gives products due to nitration in the furan ring (20) and (21), up to 40% of (20) and 20% of (21) being obtained. With the addition of concentrated sulfuric acid to the nitrating mixture, compounds (22) and (23) (approx. 30 and 10%, respectively) are obtained and none of the products (20) and (21) (81CPB635). 

G. Fleche, Oxidation of sugars with hypohalides in preparation of carboxylates used in detergents formulation, Patent EP 0798 310 A1 (1996) Chem. Abstr., 127 (1997) 307619p. 

Permethrin Urinary carboxylic Use of existing risk assessment to put biomonitoring results into risk context acid metabolite Appendix B... 

Activated olefins can also be cathodically carboxylated using C02 as electrophile ... 

Methylene butyrolactone has been used as a dipolarophile to synthesize, for the first time, ethyl-l-azabicyclo[2.2.1]hept-3-yl carboxylate using Achiwa s procedure. The synthetic pathway involves rearrangement of the spiropyrrolidine lactone resulting from the [l,3]dipolar addition.430... 

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