Titanium aminophosphates as efficient, economical, and recyclable catalysts for the synthesis of xanthenediones. Issue 20 (17th October 2016)

• Record Type: Journal Article
• Authors: Rajini, A.; Suman, C.; Ajay Kumar, A.; Suresh, S.; Venkatathri, N.
• Is Part Of: Synthetic communications. Volume 46:Issue 20(2016)
• Page Start: 1671
• Page End: 1677
• Publication Date: 2016-10-17
• Subjects: Aminophosphates -- titanium -- xanthenediones; Organic compounds -- Synthesis -- Periodicals; Chemistry, Organic; Synthesis; 547.205
• DOI: 10.1080/00397911.2016.1220578
• Languages: English
• ISSNs: 0039-7911

Abstract

ABSTRACT: Titanium aminophospates have been used as catalysts in the synthesis of xanthenediones at room temperature. Among the three catalysts tested, titanium n-propyl aminophosphate (TNPAP) was found to be more efficient catalyst for the synthesis of xanthenediones. The solvent-screening studies for this catalytic reaction reveals that MeOH: H2 O was the most suitable solvent system, yielding higher amounts (89%) of products. The TNPAP catalyst was found to be reusable for five successive cycles. The optimized reaction conditions are 1.0 mmol of benzaldehyde, 2.0 mmol of dimedone, methanol/water (5.0 mL) as solvent, rt, and 100 mg of TNPAP. A plausible mechanism for the catalytic reactions has been proposed. GRAPHICAL ABSTRACT: