To be sure that you did not do all that work and are stuck with the same safrole back:
-I-
Please take a dry, clean 1 liter erlenmeyer, put that on a digital scale, add 20°C warm distillated water, until your scale shows exactly 1.000 gram, look at the meniscus of the water, and write a thin line with a pen who's ink sticks to glass, around the flask, so that the concave underside of the meniscus is EXACTLY on that line, when the flask is exactly horizontally placed on the scale on a table, and your eyes are at the same height as the meniscus.
Now you have a 1 liter erlenmeyer calibrated as good as can be, to hold nearly exactly 1.000 liter.
You pour out the water, and dry the flask thoroughly, inside and outside, without removing that line.
Then you warm or cool 1.2 liter of your to be expected Isosafrole to 20°C.
And fill most of that in the erlenmeyer, untill its meniscus concave underside is exactly on the written thin line. Do NOT leave spilled drops above the meniscus, hanging on the glasswalls, but in case of shaky hands because of drug use or alcohol consumption, remove them with a tissue.
Now you have exactly 1 liter of ?Isosafrole? in there, at a temp of 20°C, take care that the glass of the erlenmeyer was ALSO at 20°C when you filled it. Do not check the temp NOW with a thermometer, or you remove weight as Isosafrole oil hanging at your thermometer.
Place this now back on your scale.
If it reads 1120 gram then you have at least 97% Isosafrole.
d
20=1.120 for Isosafrole.
Density at 20°C and at purity 97%.(a mix of cis and trans isosafrole btw, both will rearrange to epoxide and/or diol=glycol with oxone or performic/peracetic methods)
If it reads 1095 gram then you have at least 97% Safrole.(back, nothing happened!)
d
20=1.095 for Safrole. Density at 20°C and at purity 97%.
If it reads anything inbetween, do the simple math to calculate what % is Safrole and what % is Isosafrole.
Density is gram per cubic centimeter, at 20°C.
-II-
You can also use a refractometer, MUCH faster:
n20/D Safrole=1.5370 (at 20°C and purity 97%)
n20/D Isosafrole=1.5760 (at 20°C and purity 97%)
-III-
And you can fast check the boiling points of both at atmospheric pressure in a test tube, a few ml, heated with a gas flame, and a thermometer inside, untill the fluid boils, hang the thermometer 0.5 cm above the boiling fluid, so you measure the temp of the saturated vapour of the boiling oil!
bp Safrole=232-234°C at 1 atm.
bp Isosafrole=254-255°C at 1 atm.
-IV-
And you can just aminate and see/hope if it works, the wacko way.
-V-
And you can use TLC to compare to a known sample.
-VI-
And you can use NMR.
-VII-
And you can use a gaschromatograph.
Thank you for your patience reading this,
. LT/
WISDOMwillWIN