I am looking at a synthesis that calls for the solvent HMPT (hex-methyl-phosphoric triamide), and I am wondering if there is a good substitute. From the literature, I gathered that HMPT is mostly used for its promotion of Sn2 attack by the anionic species. While I used this solvent once in undergrad, we were basically under a watchful eye, as I know it is quite dangerous and carcinogenic, if I'm not mistaken. Any suggestions for an equally good solvent would be greatly appreciated. Thanks.