Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels. 713-95-1, Name is 6-Heptyltetrahydro-2H-pyran-2-one, molecular formula is C12H22O2. In an article, author is Chen, Tong,once mentioned of 713-95-1, Application In Synthesis of 6-Heptyltetrahydro-2H-pyran-2-one.
Two new approaches based on dynamic carboxyl-hydroxyl or hydroxyl-carboxyl transformation for high molecular weight poly(butylene maleate)
Synthesis of high molecular weight maleic acid-based polyestersviaa green approach is of great significance but also a huge challenge. To date, it is still impossible to obtain high molecular weight poly(butylene maleate) (PBM) through the traditional esterification-polycondensation procedure. Here we report two previously undiscovered green approaches for high molecular weight PBM using a slight excess of maleic acid (MA) to 1,4-butanediol (BDO) or a slight excess of BDO to MA, withp-toluene sulfonic acid as the catalyst. TheM(n)of the PBM can be up to 92 kDa, 11 times higher than those previously reported. When MA : BDO > 1, the new mechanism relies on the acid-catalyzed dynamic transformation of some carboxyl-terminated oligomers into hydroxyl-terminated oligomers through the elimination of the terminal MA units as the maleic anhydride byproduct under vacuum conditions, and then esterification and transformation reactions of carboxyl-hydroxyl occur iteratively, so high molecular weight PBM was obtained. This mechanism is a general mechanism suitable for the synthesis of high molecular weight unsaturated polyesters from maleic acid and diverse diols. When MA : BDO < 1, the other new mechanism relies on acid-catalyzed dynamic transformation of some hydroxyl-terminated oligomers into carboxyl-terminated oligomers through the elimination of the terminal BDO units as the tetrahydrofuran byproduct under vacuum conditions, and then esterification and transformation reactions of hydroxyl-carboxyl occur iteratively, and high molecular weight PBM was also obtained. Interested yet? Keep reading other articles of 713-95-1, you can contact me at any time and look forward to more communication. Application In Synthesis of 6-Heptyltetrahydro-2H-pyran-2-one.
Reference:
Tetrahydropyran – Wikipedia,
,Tetrahydropyran – an overview | ScienceDirect Topics