e g polyethylene glycol has a molecular weight between about 100 and about 2000 in embodiment 49 the molecular weight is between about 100 and about 1000 in embodiment 50 the molecular weight is between about 200 and about 1000 compounds that can be prepared by the methods i e compounds of formula i of the disclosure include embodiment 51 in embodiment 52 the disclosure provides method of any one of embodiments 1 32 wherein the compound of formula i is in embodiment 53 the disclosure provides method of any one of embodiments 1 52 wherein reacting the compounds of formula ii is at temperature between about 30 to about 100 u00b0 c in embodiment 54 temperature is between about 40 to about 80 u00b0 c in embodiment 55 temperature is about 50 to about 70 u00b0 c in embodiment 48 temperature is about 50 u00b0 c in embodiment 56 temperature is about 65 u00b0 c in embodiment 57 the disclosure provides method of any one of embodiments 1 56 wherein reacting the compounds of formula ii is at pressure of about 100 psi to about 1500 psi in embodiment 58 the pressure is between about 300 psi to about 1000 psi in embodiment 59 the pressure is between about 500 psi to about 1000 psi in embodiment 60 the pressure is between about 600 psi to about 800 psi in embodiment 61 the pressure is about 600 psi in embodiment 62 the pressure is about 700 psi in embodiment 63 the pressure is about 750 psi in embodiment 64 the.