If an actual ether is what you want (petroleum ether is a mixture of alkanes in strict chemical terminology, most probably hexanes), the easy to source and quite equivalently behaving substances are MTBE (methyl-tertbutyl ether) and diisopropyl ether, however their boiling points are higher but this only makes them safer to use than diethyl ether (known commonly as ether). The post above is the actually helpful one just beware of the whitespirit, toluene and xylenes which have above 100C boiling points so they may complicate evaporation procedures in the absence of a rotary evaporator. If you use ethyl acetate never extract strongly acidic or alkaline solutions with it and even if pH is not extreme (5,5-8,5) just move quick. I know it's safe to extract with ethyl acetate 5MeOTryptamine that I freebased from the hydrochloride but with K/Na carbonate as a base instead of hydroxide. Since AcOEt is an ester it readily hydrolizes back to the acid and alcohol that was obtained from if pH is too high or too low (acetic acid and ethanol in this case, both will make a mess you will only resolve with a suitable solvent that is insensitive to pH). If you did make a mess and there is no separation don't be a fool and throw the whole thing away there are plenty of us here to help you out. Many beginners just get angry and throw away their mixture that can actually be saved with the precious bit of lacking information.
