The short answer? No and no :-)) Well, a reserved "maybe" for the first, although you are most likely pushing the bar. Generally, the middle of November in a zone 6 is a bit late to attempt to plant and establish a J. maple before winter cold sets in but if your weather is still quite mild, you have selected a somewhat protected location, the soil conditions are right and you mulch well, you can probably still pull it off. But it's still betting a lot that your weather will continue to cooperate for at least a few more weeks after planting so the roots get a chance to settle and elongate before the soil becomes too cold. That's putting you in the middle of December......

And a western exposure in afternoon sun is asking a lot of any Japanese maple. Eastern (morning sun/afternoon shade) or any filtered shade postion out of the hot afternoon sun is preferrable. You'll get better coloring on a red leafed form if not exposed to intense afternoon sunlight plus you will have less chance of leaf scorch in summer.

Plant the tree in the ground right in the pot it came in (if not a ball) in a shletered area and leave it there until early spring just before the tree breaks dormancy to move to the trees intended resting place. Morning sun/afternoon shade is by far the best but knowing what cultivar you have can give you some varience.

Key phrase sheltered area. Otherwise, more likely to freeze in pot in ground than in ground without pot. And I would plunge it into coarser material than soil, such as mulch or sand.

Another thing is that USDA 6 is probably warm enough to plant in fall anyway. The next one down the scale, USDA 5 is where it tends to start to be too cold for unlimited fall planting. Definitely on the border, what would happen would depend partly on what weather occurred after planting. If unusual cold came unusual damage might occur.

Let's change that to "Otherwise, seems more likely to freeze in pot in ground than in ground without pot" as I'm not sure this has actually been demonstrated in an organized way.