Di methylene

Aromatic diisocyanates such as toluene 2,4-diisocy-anate (TDI) and methylene di-p-phenylene isocyanate (MDl) are usually used. Aliphatic diisocyanate such as hexanediisocyanate (HDI), although it has the advantage that the TPU synthesized from it is softer and not prone to turning yellow, is seldom used due to its high cost. 

Fig. 3.61. HPLC-UV chromatogram at 230 nm for the analysis of the aromatic amines listed. (1) 1,4-Diaminobenzene (2) 2-chloro-l,4-diaminobenzene (3) 2,4-diaminotoluene (4) benzidine (5) 4,4 -oxidianiline (6) aniline and 4-nitroaniline (7) o-toluidine (8) 4,4 -methylenedianiline (9) 3,3 -dimethoxibenzidine (10) 3,3 -dimethylbenzidine (11) 4-chloroaniline and 2-amino-4-nitrotoluene (12) 4,4 -thiodianiline (13) p-cresidine (14) 2,4-dimethylaniline (15) 2-naphty-lamine (16) 4-chloro-o-toluidine (17) 4,4 -methylene-di-o-toluidine (18) 2,4,5-trimethylaniline (19) 4-aminobiphenyl (20) 3,3 -dichlorobenzidine (21) 4,4 -methylenbis (2-chloroaniline) and (22) o-aminoazotoluene. Reprinted with permission from M. C. Garrigos et al. [130].

Kmeshy et al. [96], for the first time reported recyclable catalyst based on polymeric Cr(lll)(X) salen complexes derived from (lR,2R)-(-)-cyclohexanediamine with 5,5 -methylene di-3- erf-butylsalicylaldehyde and X = Cl, NO3, and CIO4 67-69 (Figure 22). These complexes were used in regio-, diastereo-, and enantioselective aminolytic kinetic resolution (AKR) of fra 5-stilbene oxide, trans- S- methyl styrene oxide, and 6-CN-chromene... 

Phenols have definite protective action. Examples are P-hydroxybiphenyl, hydroquinine and pyrogallol, methylene di-b-napthol. 

An even more interesting reaction, with potentialities which should be further explored, is that which occurs when l,3-anhydro-2,4-0-methylene-D,L-xylitol is treated180 with p-toluenesulfonyl chloride in pyridine (during 3 days at room temperature and then 8 hours at 70°). The expected 5-O-tosyl derivative is accompanied by a monochloro-monodeoxy-2,4-0-methylene-di-0-tosyl-D,L-xylitol formed by opening of the anhydro-ring. 

It is uncertain whether the 2-bromophenanthridine-6-carboxylic acid obtained when 223 is treated with bromine in methylene di-chloride (see p. 362) arises from attack on the azepinone or the phenan-thridinecarboxylic acid, although the former seems more likely. 

Starting with l,l/-methylene-di(2-naphtol) 13 and 5-nitro-phthalonitrile 12, bis-phthalonitrile 14 was prepared. To obtain metal-free ball-type Pc 15, a suspension of 14 in dry amyl alcohol and lithium metal was heated in a sealed tube at 170°C for 8 h, Fig. 4. The metallo Pcs with zinc 16 and cobalt 17 were synthesized by heating a... 

Isocyanate Grafting. Weakly O2 plasma-treated and diborane reduced polypropylene foils with about 7 OH/100 C were reacted with diisocyanates (hexamethylene diisocyanate (HDI), methylene-di-p-phenylene isocyanate (MDI) and toluylene-2,4-diisocyanate (TDI)) as schematically shown in Fig. 7. Subsequently, different fluorescence... 

Isoouanates. Various isocyanates are employed in the polymer industry. These compounds are powerful irritants and they are highly toxic. Of particular interest are methylene-di-paraphenylene isocyanate (MDI) and toluene-2,4-diisocyanate (TDI). Various alkyl isocyanates (e.g., methyl, ethyl, propyl, butyl, and cyclohexyl) derivatives may also be of current interest with respect to potential occupational health hazards. Simultaneous analysis of MDI and TDI by HPLC has been accomplished by a modification of the method of Dunlap et al. (28). Air samples are collected in impingers containing p-nitrobenzyl-n-... 

SYNS BIS-4-AMINO-3-METHYLFENYEMETHAN (CZECH) 3,3 -DIMETHYL-4,4 -DIAMINODIPHENYL-METHANE MBOT ME-MDA 4,4 -METHYLENE-BIS(2-METHYLBENZENAMINE) 4,4 -METHYLENE DI-o-TOLUIDINE... 

METHYLENE DITHIOCYANATE see MJT500 4,4 -METHYLENE DI-o-TOLUIDINE see MJO250 METHYLENE GLYCOL see FM 000... 

TETRAETHYL S,S -METHYLENE BIS(PHOSPHOROTHIOLOTHIONATE) see EEH600 0,0,0, 0 -TETRAETHYL S,S -METHYLENE DI(PHOSPHORODITHIOATE) see EEH600 TETRAETHYLOLOVO see TCFOOO TETRAETHYL ORTHOSILICATE see EPF550 TETRAETHYL ORTHOSILICATE (DOT) see EPF550... 

Imines.—The compounds so formed and containing the group (—NH—), are known as imines. The four carbon imine given above is named pjrrrolidine, and the di-amine from which it is formed, as tetra-methylene di-amine, also as putrescine. It is found as a putrefaction product of animal flesh. The analogous five carbon compounds are, penta-methylene di-amine, or, cadaverine, and the imine is piperidine. The last compound is found in pepper in combination as the alkaloid, piperine. 

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