Didecyldimethylammonium bromide (DDAB): a universal, robust, and highly potent phase-transfer catalyst for diverse organic transformations

Investigation of the Stability of Quaternary Ammonium Methyl Carbonates

“…However, DSC measurements by Chidambaram et al [23] establish the decomposition temperature of TBAB as 255°C in contrast to this study's observed decomposition commencing at 140°C. Busi et al [25] using TGA, DTA, and DSC, established the decomposition temperature range of nine tetraalkylammonium chlorides with phenyl substitution on two of the alkyl groups to be 85-300°C with a 70-150°range for individual quaternaries.…”

“…A decomposition temperature for TBQ MC of 180°C is also in general agreement with 206°C for TBQ Br derived by Chidambaram et al [23] from DSC measurements. Katritzky and coworkers [24] observed decomposition temperatures for a series of TBQ salts in the range of 180-222°C, also measured by DSC.…”

Co(II) Catalyzed Solvent Free Auto-Oxidation of Methylbenzenes to Substituted Benzoic Acids Under Phase Transfer Conditions

“…The dependence of oxidation rate on oxygen flow rate was investigated in the range of 30-200 ml/min (Entry [19][20][21][22]. Based on these results we concluded that increasing the oxygen flow rate increased the oxidation rate.…”

“…Some years ago we studied the ruthenium catalyzed oxidation of 1-phenyl ethanol to acetophenone using didecyldimethylammonium bromide (DDAB)/H 2 O 2 /dichloroethane system and found unusual PTC mechanism which differed from the classical extraction and interfacial mechanism often encountered in PTC oxidations [18]. Recently, we explored the DDAB as universal, robust and highly potent phase transfer catalyst for various organic transformations [19][20][21]. We have now realized that solid liquid extraction of Cobalt (II) chloride by anion exchange with lipophilic ammonium bromide salts in organic solvent generates a very potent auto-oxidation catalyst for methylbenzenes (Eq.…”

UV–Vis spectrophotometric studies of self-oxidation/dissociation of quaternary ammonium permanganates (QAP) – impact of solvent polarity

“…CTAP and TBAP were synthesized in the laboratory as per the standard procedures [21,31]. Benzene (Merck, India), dichloromethane (Merck, India), chloroform (Merck, India), chlorobenzene (Spectrochem), dimethyl formamide (Spectrochem) and ethyl acetate (Merck, India) were distilled before use and the fractions obtained at their boiling points were collected [32].…”