Synergetic effects of naturally sourced metal oxides in organic synthesis: a greener approach for the synthesis of pyrano[2,3-c]pyrazoles and pyrazolyl-4H-chromenes Sachin K. Shinde 1 • Megha U. Patil 1 • Shashikant A. Damate 1 • Suresh S. Patil 1 Received: 10 May 2017 / Accepted: 4 November 2017 Ó Springer Science+Business Media B.V., part of Springer Nature 2017 Abstract A clean and more economic protocol for the synthesis of pyrano[2,3- c]pyrazoles and pyrazolyl-4H-chromenes has been carried out using bael fruit ash (BFA) as a non-conventional natural catalyst in aqueous condition at ambient temperature. The catalyst was obtained from renewable resources by simple thermal treatment to dry rind of Aegle marmelos (Bael) fruit and formation of its active phase was confirmed by AAS, DSC-TGA, XRD, FT-IR, and SEM techniques. The BFA catalyst was found to be a green, highly active, easily biodegradable, and recyclable without loss of activity after the fifth run. The methodology provides an alternative platform to the conventional catalyzed process. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11164- 017-3197-8) contains supplementary material, which is available to authorized users. & Suresh S. Patil sanyujapatil@yahoo.com 1 Synthetic Research Laboratory, PG Department of Chemistry, PDVP College, Affiliated to Shivaji University, Kolhapur, Tasgaon, Dist-Sangli, MS 416312, India 123 Res Chem Intermed https://doi.org/10.1007/s11164-017-3197-8